your argument for #1 makes sense so i think i will stick with 60m for speed change drills which there are marks on the track i can use to get a very close estimate
i understand your argument for 2x a week and it makes a lot of sense but i am a little stubborn about doing it 3x a week for a few reasons:
i did 3x a week last year and i managed to stay injury free as well as progress pretty well. i dropped an estimated .4-.6 in the 55m after 3 months of S-L and then switched to tempo program at my high school where my results halted
im doing 3x per week during GPP and im handling it well
i like doing speed work way more than tempo
and this is as much about as having fun during track as it is improving for me, i know im not going to be elite so i want to have fun while doing it. So i would much rather have 3 lower volume HI days than 2 medium volume HI days
also i do have access to some limited recovery such as foam rollers and i could do contrast showers too