When figuring out which shots the FG% is based on, only Take Shot and the Shot Location Tendencies are factored. Driving Tendencies don't matter. Any player with an Inside Shot Tendency above 0 are effected by the scale being off but players who take the most Inside Shots will be affected the most.
What's weird is if you put the Take Shot slider at 100 and all Shot Location Tendencies at 0, then put the Take Shot Slider at 100 and all Shot Location Tendencies at 100, the player will take the same amount of shots.
There might (MIGHT) be a way to figure out how to go around all Shot Location Tendencies and just use Take Shot Tendency to determine where players take shots from. During gameplay, you would just have to make sure that a player has plays called for him that will put them in locations on the court where you want them to shoot.
For example, this may work:
Blake Griffin
Inside Shot, Close Shot, Mid-Range Ratings what they are in the roster.
50 Take Shot Tendency
77 (or whatever it is in the roster) Inside Shot Tendency
0 Close Shot Tendency
0 Mid Range Tendency
With Take Shot Tendency at 50, Blake will take 15 shots per 36 Minutes. If he keeps his Inside Shot Rating (87) he may be able to still get a sim FG% around 50 (I haven't tested this yet) because his tendencies don't tell the sim-stats to factor in % from the other locations except for the Dunk Rating, which for him, is at 99 and would add 5% to his FG%. Theoretically, this would equal 87 Inside Rating (47%) and 99 Dunk Rating (5%), giving him a FG% around 50-52%, depending on the sim. During gameplay, the low post plays will still put him in position to take shots when in that range (I've tested this part and, even with a 0 Close Shot Tendency, it works.)
However, I don't know if I want to put in the time to test this theory, and if it works, to completely redo all big men. And, if it worked, find all players that would need to be edited, then test the results team by team to see if it worked. I can't tell you how obsessed I've been with getting this right and how many hours I've spent re-editing this entire roster.
I also can't tell you how frustrating it is to get to this point and find out there's an obstacle that can't be overcome when I've figured out virtually every part of the game's sim engine, then applied scales across the league that work for sim stats and gameplay, and have been able to correct the parts of the game that people have said can't be corrected without breaking the gameplay.
I put a request in to Santa for a patch to implement a new scale for Inside Shot Rating. Hopefully, I'm on the Nice List.