Are eye-drops a PED? I know, it’s a very long thread and just when you think it’s run out of steam someone re-ignites it and off we run again:D
Esti your program has plenty of balance and logic, but it honestly looks more likely to succeed for a specialist 200m guy. Then again, perhaps if you had time you could implement that for a block to bring up some intensity as an intermediate step and then go into something more 400m-specific, like longer split runs 300+150 to introduce some lactic tolerance work while not sacrificing speed or form out to 300m.