Personally, as a general rule of thumb, I like 10% TFA fruit flavors with 5% ethyl malto.
TFA Tobacos, generally 3-4% with additions on top of that.
I am totally experimenting today with blueberry extra and Virginia Flue Cure. Strawberry with Virginia Flue Cured.
Ry4 with ethyl malto, graham cracker and vanilla and caramel.
555 with acetyl przdyl [spelling?], honey [not too much as that is easy to overdo], caramel, and whip cream [I like that one and am playing with percentages].
Have fun!!!!!!