How old is he now?
I think set naps might be less stressful for you than A times - naps are at the same time each day (at most 15/20 minutes earlier if an ewu or short nap).
If he's 6 months or older, I would try this:
WU: 7
S: 930-11
S: 1-230 (or whenever he wakes)
CN if needed (may push BT a bit later)
BT: 7
If he naps later than 3, I would do ebt 3 hrs from wu. I think you were aiming for an 8 wu, so you could adjust accordingly but most baby routines suggest a 7/730 wu as being best for setting their body clocks.