SCS, CDE and IMH gain enough from EPC7 + Bronze Appraisal that they take 1 less AP to master/softcap. So SCS takes 3 turn 3 and 2 turn 4, CDE takes 4 turn 3 and 3 turn 4, and so on. I should have been clearer why those shouldn't be trained turn 3.
As for your plan being better for spiritual, the issue with this is I can't see your plan actually helping us getting to Foundation turn 4, though @Black Noise could check it easily I guess, so both plans would get it turn 5... and the cost for doing such a plan are fairly big: Significantly less Physical cultivation successes, A few AP wasted by training the wrong arts at the wrong time, but mostly being much weaker in turn 3 leading to challenging for standard vent and +1 GSS being iffy, as well as not being ready to answer challenges as easily. Also, I really want to master FVM/FSS.
Basically, from what I can see, this is just making a couple turns with less efficient use of pills in order to get more steafast base cultivation AP when those are currently at their lowest point (no EPC7, -0.1 multiplier, no multi sites, -1YSS). Arguably if it is possible to get Foundation turn 4 it would be worth the lost AP and temporary weakness, but I don't think it will.
Uhh, if I am reading you right reaching Green 3 at turn 5 needs 600 points from overflow (since it gets 1000 points from turn 3, 400 from turn 4 and 400 from turn 5). I don't think that overflow will work that way; since it incentives to pick arts that have small soft caps and high multiplicative bonuses to forgo physical/spiritual cultivation entirely. Which strikes me as an unintended system exploit.