Here's the deal.
If you want buds that taste like Blueberry.
Grow Blueberry.
If you want M<ango ,grow mango.
And so on.
There are strains for every fruit flavor on earth.
And they taste more like those fruits then if flavored with the juice or something.
The plant changes the sugars when it takes it in.
So adding flavored stuff doesn't seem to work(my friend tryed with pineapple juice) he would have had fruitier bud if he just got the right strain.

On top of that it is important to feed them the right stuff to bring out the sweetness. It just brings out it's natural flavor. So once again it depends what strain you use.

You want to feed them Sea Bird and Bat Guano.
LIke BUdswel or Fox Farm Big Bloom.

Alot of the time it's the chemical nutes that ruin the flavor.

I suggexst using Pure Blend Pro bloom for soil, silicate and either Budswel or Big Bloom.
I"m trying Big Bloom this time.