Update. I've discovered I dont function nearly so well at night as I had anticipated. I was running with core sleep 4-8, after shifting this to 2-6 I can see an improvement.

Also notable features: I can shift the naps around a fair amount, but too much core sleep, or hitting the snooze button after waking from core sleep throws me off for a long time after. The amount of sleep in each session doesn't seem as important in how I feel afterwards as how I wake up. Waking up in the middle of deep sleep going blurg and snoozing for 10 mins is followed by feeling awful. Being in light enough sleep that my phone screen turning back on before the alarm goes off is enough to wake me and then getting straight out of bed is followed by feeling really energetic.

It's incredible how much sleep I'm able to get in the naps. Sometimes schedules mean I can only really afford 10/15 mins, and I feel myself waking up from real sleep after this.