hello mate
I train guards too. Although my guards have high jump shot, jump range and handling skills. their inside shot is quite poor. I started playing with tactics and every time I pick a tactic where the players shoot closer to the basket my guards percentages on shooting drop more and more. I guess for shooting in the paint you really need inside shot and it seems that jump shot, jump range and handling are almost useless...
Good luck with finding the right tactics for you...
Moominpapa