Try this instead

• Bubblegum - 6%

• Strawberry Ripe - 1%

• Sweetener - .5%

• Watermelon - 3%

If you look at the recipe you adapted yours from and compare it to yours, you'll notice that you added an additional 10% of flavoring. 25% of flavoring is probably too much. Sometimes a high percentage of flavoring works, but most of the time it doesn't. I don't have experience with TFA Bubblegum, but try cutting each flavor's percentage in half and see if that helps you at all.

I prefer CAP Sweet Watermelon or LA Watermelon to TFA.

I'd try something like: 4% FA Blenderize (Tutti Frutti)

2% TFA Bubblegum

6% CAP Sweet Watermelon

1% CAP Sweet Guava

1% TFA Honey Dew

0.5-1% TFA Sweetener (or just a 10% Sucralose diluation substitute)

See how that works.

Have you tried caps double watermelon? It's my favorite watermelon flavor by far.