Looks good I will try this and post back here with an official review. Subscribe to my reddit account we do give aways every 1000 down votes. Rate,like and comment!
I am a noob but just mixed a similar concoction the other day. Same flavors, just different percentages. I think your percentages are probably better as the TFA Key Lime is pretty strong (I used 7% which is a bit much). Interestingly, my juice is a pink color after steeping a few days (no, it's not the nic) which is kinda cool I guess.
That seems like a lot of graham crust (cheesecake (graham crust) is more crust than cheesecake) vs the other flavors; I'd probably add some cheesecake (1.5-2%), whipped cream(1.5%) and cream cheese icing(1.5%) to smooth it out and make it more cheesecakey. If that overpowered the lime, then I'd up the key lime in .1% increments until it balanced out just right.
But that's all just from "visualizing" the flavor interactions; without actually tasting the original mix, I wouldn't know for sure.
I actually make a similar keylime that is an adv for me.
2% Keylime
2% Cheesecake
2% Vanilla Bean Ice Cream
4% Cheesecake Graham Cracker Crust
All TFA
So I have slightly less Graham Cracker than in OP's recipe. But I personally find that both the Keylime and Cheesecake are both very strong flavors, easily overwhelming other flavors and unless the graham cracker is higher in percentage it doesn't come through. Even at 4% or 1.2ml for a 30ml bottle it is an underlying flavor imo.
I have a different experience with GCC, for me, it starts out subtle but becomes more and more noticeable in the mix as the flavors blend with time, So I always use less of it initially than I see in other recipes. But if it's too subtle then yeah, you'd still need enough to be able to taste it in the first place. It's not as tricky as regular pie crust though, which can easily overwhelm a mix if you add even a little bit too much, so I can see adding 4%.