Claire, I ended up waking him after about 25 minutes (so at 11:10). I knew he'd only be able to sleep till 12:15 b/c I would have to wake him to feed him lunch before we had to go. Then he'd either be up the entire afternoon or CN, if I was lucky. I didn't want to risk it. I just laid him down again at about 2:15, so we'll see how it goes.
We're pretty much on the same schedule but we are getting a bit later WU's (knock on wood!). Most days it's looking like this:
6:30-ish WU (sometimes 6:15, today 6:50!)
10-10:25 nap
1:00-2:30 nap
7:00 BT
So far, this seems to be working fine. However, today is the very first day he has ever fought me on the nap. He is having a bit of separation issues, so I don't know if that's the case. Normally, he goes very willingly, but both times today he clung to me crying. I had to leave him there and, seriously, within 1 minute he was asleep. So, I think it was just the separation, not that he wasn't tired. So, yeah, a whole other issue to deal with now.
He's also been really tired lately. He's teething and getting over being sick, so that probably has something to do with it. But over the weekend, I had to put him down for a nap at 9am!

He was practically begging for it. LOL! I let him go an hour, instead. Figured he needed sleep or something.
For now, we're just going along with this schedule. If we start getting EWs again, I'm going to have to tweak it a bit. I need to start getting him to 1 nap on the days dd isn't in school. Today would have worked out 'perfect' had we not had an issue with the soccer schedule. I'll probably only let him nap 1.5, if he makes it that long, so that we can keep with the 7pm BT tonight. Seems like my kid needs more sleep that dd did at this age. He wants to sleep more during the day, so we still have a hard time getting to 1 nap. His 'A' time seems to be about 4 hours after waking in the AM, then about 2.5-3 after a 30 minute nap in the AM. We'll get there....eventually.
Honestly, if the 2 nap works for you guys and you don't get EWs, then I say keep with it until he can go longer. That's pretty much what we're doing b/c J seems to need that morning nap. I haven't tried a PM CN, so not sure if he would go for it, but I have my doubts since he isn't use to it. But IDK! If you can push that AM nap to 10 or even 10:30 and keep it 30 minutes max, then do the PM, that might help with the EW?! Heck, today he did the AM nap from 10:45-11:10 and went down again at 2:15, so we'll have to see how this works out!