Hi
How's the nap training going?
I, like you, did ST at bedtime and night time first when DS was going through the 4mo sleep regression. Having done it for nights, naps actually took less time than I thought..but I think we started a little later with naps, maybe closed to 5mo.
If you're LO is settling to sleep with PU/PD, you're doing it right
I would try with just one nap a day at first. That gives the others to compensate if one is tricky.
With both of mine, I had a sense of whether they were starting to settle or not after 15-20mins. If they looked like they were going to settle, I'd continue until they did. If they looked like they were just getting more & more worked up, I would AP that nap and try again another time/day. That gives your LO the sleep they need and saves your sanity!
Good luck xxx
PS- your A times seem to get shorter s d shorter as the day goes on? That might be due to the short naps but will keep giving you short naps. Might also be contributing to the long wide awake NWs. I might try keeping her up a little longer before those later naps if you can.