Looking at your day yesterday, I think he was maybe UT going down as he'd had such a good nights sleep and that led to the 1 hour nap which wasn't enough to be totally restorative. The next nap wasn't bad (1hr 20 altogether despite the wakening) and its great you got him back to sleep.
Typical sleep for your LO is:
9 months old 2 naps of 1.5 hours each;
11-12 hours at night
So overall yesterday he did 12 hours nighttime and 2 hour 20 daytime sleep so not bad.
How did last night go? I think it might be time to start stretching his A times a bit. You'd be aiming for a routine like this:
7am: Wake up
10am: Nap
11.30am: Wake up (1.5 hrs)
2.30pm: Nap
4.00pm: Wake up
7pm: Bedtime
If he has a good night I'd go for a slightly longer A time and see how that nap goes. If it goes well, extend the next A time too.
I'd be tempted to try it as I think he's probably caught up on a lot of the OTness now. Remember it can take a few days to see a change. If it were me and I were getting short naps and having to do a catnap I'd want the A times to extend. He is at the stage where sleep goes wonky a lot of the time anyways. This has some good info on changing routines and how best to do it! I don't think you are at the stage of shortening the naps yet obviously but in terms of extending the A time it has useful info!
http://babywhispererforums.com/index.php?topic=145285.0So i guess what I'm saying is start increasing the A times. You are getting short naps anyways and he might just need a consistent hand to get used to the longer A times for a few days and help extending his naps if he wakes.
What do you think? How'd last night go?