Practicing foul shooting can help but a lot depends on how it's done. Shooting on your own (even in the hundreds) won't hurt but may not help that much either. Why? It's different than a game when you may be tired or nervous or thinking more about everyone looking at you than about making the shot. Game conditions can't be recreated but they can be simulated. You can Incorporate foul shooting into your scrimmages complete with whistles, lining up the players, being watched by your coaches and teammates, etc. It takes time away from the play but if the pecentages are atrocious can you really afford not to it?
I'd just like to see some sort of change somewhere. It's a simple process that doesn't require all the ball spinning and hand changes they use. Anything more than three bounces and up is just a sign of hesitancy and discomfort. I don't see much softness at the rim and some of the misses are really ballistic.