Hi there and welcome, I've added a link which is handy to keep for reference
Average A times- BOOKMARK ME! Looking at your day I think you need to push the A time, the first nap your trying is 7am from 5.30 WU which is way too short A time for his age so your getting a short nap at this age your A time would be around 3/3.15 hours. Then after WU at 8am your trying a nap at 1 hours 55 min later which again results in short nap as not enough A time...
I'd say if WU is 5.30 then first nap no sooner than 8.30, if he wakes at 30/35 mins try to resettle him if he naps over an 1.5 hours then make next A time 3 hours min, if he does a short nap then only knock 15/20 mins off A time.
At this age really he should be having 2x 1.5 hour ish naps so you need to push his A time to get a more balanced day. 6/6.30 BT will prob result in 5.30 WU as that's a good 11 hours worth of night sleep.
Naps 30 mins are generally OT
35-45 mins UT
But that's only general and doesn't always apply.
Hope that makes sense