Hi
It sounds like you can increase the A time and start moving towards dropping the CN. The CN is dropped around 6 months (of course all LOs are different) and there can be some no CN days and some still with a CN whilst you all get settled into a new routine. During that time you might find EBT is helpful.
Sleepy signs at this age can be confusing because they show the same signs if they are bored or want a change of scene. Maybe just change the activity, sing a song, move to a different room etc. And just to really confuse you they can also show sleepy signs and appear very tired and ready to sleep if they are OS (too many different activities or new toys, visitors etc) so it is important to consider what has come before the sleepy signs when decided what to do next, and also watching the clock and working towards a consistent A time that is suitable for his age too. Add to that, their body clocks can be telling them a nap time is approaching so they start to show sleepy signs when really they are not fully tired enough to get a good nap.
Extending the A time should be done gradually to give the body clock time to adjust to it.
http://babywhispererforums.com/index.php?topic=64158.0You'd be looking at a guidance of around 2hrs 15 to 2hrs 30 for his age.
So, I think that some of his A times do look quite short. I would increase by 10 or 15 mins (gently, low key activity to just delay that sleep without making him upset) hold there for 2-3 days then increase again, hold for 2-3 days etc, until you reach around 2hrs 15. If he appears to be able to take a bit more than 15 mins then it's ok to go a little quicker with the increase, some handle it well.
I would increase the first A which looks short, leave the second one at 2hr 10 if this is what you usually have, whilst the first A time catches up iyswim.
The increase A time should help get a longer nap and will space those two naps across the day more evenly and eventually over the next few weeks the CN won't be needed so CN refusal won't be an issue for much longer.
Hope this helps some.