These players are my best shooters. Their JS/JR in the following order is:
Enn Heinsaar-12/9: Shoots pretty badly haha... the latest game i had with him was his best, otherwise actually he's pretty bad XD. His experience is only awful so that could say a bit.
Txema Robles- 9/7: A great overall shooter, really torches the 3s, but this could be due to his better experience (mediocre) and he's much more balanced in skills than my SG is.
Laurent Gros: 9/7: This trainee is another great 3 point shooter, but his jumpers aren't too great. Again this could be due to experience (atrocious haha). He's quite balanced too.
So my guess could be to really BALANCE out the player's skills and keep JS only 2 above or lower than your JR (maybe 3 above for an SF).