Perfect! That's exactly what you should do for NW's and you can consider yourself very fortunate. You've obviously done a great job at help your LO learn to resettle. DS kept doing early wakings in bits and pieces until we really nailed that one long nap during the day. With T, I pushed him for 15 mins longer every 5-7 days, depending on how he seemed to be handling it. Once he made it to 10:30am, he pushed himself through until 11 by just tearing around. After that, I moved him up by 30 mins every 4 days and he just rolled with it. I was in charge but I watched him closely for sleepy cues (getting wobbly and lots of yawns) so I sort of let him dictate how long he could go. The one thing I would suggest is sticking with a set bed time. DH and I kept tweaking T's bedtime by 15 mins or so, depending on how long he napped for and this really messed him up. Once we went back to his regular BT, it was a much smoother road.
I was pretty sure T was ready because one nap would always be short and he started to get quite ticked off at nap time. I also thought the day-care's plan for incorporating two naps was just not feasible for T's needs and so I started the transition. He naps for 2 hrs from 12:30-2:30, sometimes a little longer if it's been a busy day, and his BT is 6:45, starting bath etc. at 6:15.
If you think your LO is fine on two naps, keep it up. Each baby is different. My niece is only 4 days older than my son and she still has two naps between 1-3hrs in length and sleeps 12 hrs at night. SERIOUSLY?! She is a VERY physical child though and is in day care 5 days a week.
Cheers,
Laura