You would be correct, those are the 3 you get from there. Once you finish your attribute upgrades, then the only thing you can gain out of practice are the ones you get from the drills (ie draw fouls, shot IQ, hands). That's the unfortunate part for me, you basically go from having a guaranteed +1 every practice to having to settle for a +1 every three practices if you say no to the drills and just exit out of there. Wouldn't be a huge issue if the load times in this game weren't crazy, especially when you have a lot of saves so I usually just give up after maxing those three out and getting my upgrades. I would love to have draw foul at a higher rate for online purposes (since you can still get a lot of calls offline) but that would take so long just going in and out of them and hoping to get that to be the +1 that it's not even worth it and 2K18 will probably be out by the time it happened.