Hi, sorry i didn't see your post until today.
Hum, from 45 to 30...normally i would say that is too much A time, but in this case i don't think it is. 2.-3hrs of A time is normal for your LOs age. Why the 30mins? Taylor's mom just wrote this and i think it fits:
infants start to come out of deep sleep at 30 minutes, so some may wake up right when they start to come out of deep sleep .
I would keep at extending his A time and even dare to say extend it a bit more. 2.15hr was the magic no for us at this age.
I know how frustrating this is, but hang in there it does get better!