Good advice. One thing that happens sometimes I try to shorten the A times is that he just refuses to go to sleep (just cries) even thought he is *clearly* tired. Usually I just give up for that one and try again in another 10-15 minutes after he's calmed down.
Yes, he has occasionally had long naps (1.5 hours), but pretty infrequently. I haven't tried nap extension. I think I mostly haven't tried it because I had no luck with it with DS #1 (who was also a short napper for the first several months). I know I shouldn't assume that it won't work with DS #2. Although I have never tried it, I imagine that if I tried to do shh/patt when he wakes after 1/2 hour, he'd just coo and squeal at me thinking it's a fun game with Mommy. Usually when he wakes, he's wide awake, not drowsy. Should I try it anyway?