when i was playing the draft combine, my first sg was terrible. he couldnt even hit some open shots (and i practiced his shot... but then again, they never told me what was a perfect release). however, what i realized really helps is consistency (of course
) and shoot of dribble. With my shoot off dribble high, i could catch and pop, sometimes even from the 3point line though my 3 pointers were only about 60ish (default for scoring guard, dont remember). so, i'd say focus on one of these, but that was only for combine so i cant guarantee anything.