i can't remember if work ethic is a factor in GPA, but i feel like it is highly likely that it is. i think its WE, high school GPA, college GPA (for non FR), and study hall minutes.
on the original question - its not supposed to matter what you do in practice planning. you can do 0m in everything and it should be the same as any other configuration. i'm assuming ineligibles sit in d2 (wasn't it only d3 where they can just play anyway) and you are talking about ineligible recruits in their 1st year, not dudes who flunked out. i think everyone just maxes SH because its the only thing we don't get easy, visual proof that it doesn't do anything. anything else and you can see, 80m, its still not growing. im pretty sure SH minutes don't matter either, but i max it myself.