I have the same problem with some recipies I vape mtl though so sometimes I just bumb up the percentages some. Obviously this changes the recipe and some flavors don't scale the same as others. I also always have a ry4 juice on hand. There is definitely some trial and error involved in diy. I do use a little sweetener in a lot of my recipes though that makes some flavors pop. Just curious what is your vaping style.

also keep in mind that it's not meant to be Vaped right after making it. you're supposed to let it steep. if you're out of juice completely you can look up quick steeping. but really you're not going to hit the flavor notes you're looking for for about a week.

I would grab a bottle of cap super sweet and add 1 drop per 30 ml of mixed juice I do this on mixes I want a lil more pop from

First off I would try to rebuild the RDA you're using. coil placement can be crucial, a coil to high or low can be the culprit behind muted tasting juice. if that doesn't help, try a different RDA. You should get some flavor, even if you need sweetener to taste more.

2nd troubleshooting tip once you have your atty dialed in would be to try adding in 2-3 drops of FW Sweetener or 1-2 drops CAP SS per already made 15ml (everyone's sweetener preference is different but I had a very hard time tasting juices when starting DIY and this is what worked for me). I was able to quickly wean the sweeteners down but I needed a lot at first, like 0.75% CAP SS or 1.25-1.5% FW Sweetener.

I prefer to make juices, test them and then add in drops after I know what it tastes like without. some flavors are sweet on their own (many vanilla/ cream/ marshmallows), and some even have added sweetener already (ie CAP Sweet Guava/ Tangerine etc)

Any flavour should pop, good or bad. For a few years after i started sometimes after reworking i would get no flavour so I kept making stronger flavours but still got nothing. Then I would Berwick and the flavour was so strong i couldn't vape it. Play with your wick, cut the tails shorter, thin the tails a little stuff less or more through the coil or make sure your tails are not stuffed in the juice wells, only dipping in the wells and not curled up. If your coil is heating from the center out then its the wick or even not enough watts.

How does shop-bought bottles taste? Is it just your DIY flavours that don't taste like anything?

If it's only the DIY then you've found your problem. Share a recipe or 2, naming specifically your vg/pg ratio, as well as steep time.

The higher your vg ratio the longer you need to steep. Also, after a long steep certain other flavours falls away again. Don't expect a 6 months steeped bottle to pop with fruits, though a custard sometimes needs a minimum of 2 months.
Use the same recipe and do a 60 / 40, then the same recipe and increase the flavour with say 5%.
At some point you should find your inner happiness.

Just remember all flavours don't pop at the same percentages. I have a vg / pg recipe of 94.5 / 5.5, of which is 4.5% flavour and 1% distilled water. Trust me it pops.

What is your setup?

Check your wicking, if. its not just right you won't taste anything

If you can't taste it after a good shake then steeping it or letting it rest for a few weeks won't change that. I would put money on you have changed your coil or wicking.

Most things you mix will not be great immediately after mixing most take some steeping time . That's why so many people mix up a shit ton of recipes and keep pumping them out hoping to find something that taste great immediately while waiting for the early mixed ones to steep.

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If you really need an outstanding recipe that tastes fantastic immediately to hold you off mix Fizzmustards version of Adirondacks 'Placid" . It's truly OUTSTANDING immediately .

Search for 'PLACID' on this subreddit you will LOVE IT.

First, if you're sampling new mixes never use a mesh atty especially if you're mixing vanilla, custards or other delicate deserty flavors. Secondly, most flavors bloom and mature over the next few weeks while few are good right off the shake. It's called steeping which to the layman means just wait for it to fully expand in the VG/PG base and mellow out. Higher PG mixes loose density but flavors are more pronounced so play with this ratio. A decent starting point would be 60/40 VG/PG. Lastly, use a digital scale in grams with a .00 resolution in the hundreds meaning it can register down as low as 0.01g. Lastly, protect your flavors and mixes from heat, light and open air as much as humanly possible. All these things deteriorate your flavor experience.

Yes just add .75% super sweet. Its the sweet spot for me, where its nice and sweet, but not too sweet to where its killing coils super fast. I reccomend Purilum super sweet, but Capella super sweet will work as well. Dont add super sweet directly to your tank or coils, mix it in with the pg/vg and flavors while you make it.

Yes, there is Adaption.

(up to a few Weeks)

i'm having this same issue with everything I mix, even single flavors.