Actually hun that's not bad at all! It's not unusual for days to get rather long during a transition. I've heard some do 14hr days, but that's just not for me, that's why I kept chopping down that pm nap and went cold turkey to one nap at 10.5-11mo!!
A wise BW once told me to check their average sleep during a day before the transition. You were getting around 2hrs a day DT sleep (give or take). If he only takes 1hr 20/30, just do BT the time that he's missing, so 30-40mins earlier. That really helped me throughout the transition. There were days I did a 6pm BT (we used to have a 7pm BT). It is yucky all the inconsistency but that way you're doing everything you can.
Wrt the waking earlier, that's totally up to you. Personally I wouldn't as 6.30am is our wu in this house. I tried for months to get it to 7 with no avail
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I would pd for nap around 5mims before A time is up so around 3hrs 55mins. I totally think he can handle it. Then let's increase that second A to 3.5hrs instead of the 3hrs 15mins. Hopefully he'll be slightly more tired to take that nap.
So let's work on a 6.30am wu
Wu 6.30
A 4hrs
S 1hr 20-30. (10.30-12)
A 3.5hrs
S 40mims (3.30-4.10)
A 3hrs 20
S BT (7.30)
Obviously the day might sway here and there. If he takes longer to fall asleep for second nap, I would cap it at 30mims or even 20mims just to get to a reasonable BT. It might also mean the last A might need to be reduced slightly too just because they can't go as long on less sleep.
If he refuses his second nap, try and keep him in his bed for as long as possible as long as he's not unhappy. I used to do this with DD. She'd play around up there for 20mims, then sometimes fall asleep, sometimes not. But as lomg as she was just singing and messing about, I'd leave her there for 25mins and get her up and do low-key A until BT. I do think that quiet time helps. Then I do BT at 6 or 6.15 xx