How did the night end up being?
I'm lucky with DS2 as in he will CN and have a long nap still or just one nap or lots of CN if we're out and about and doesn't massively bother him but DS1 at this age I had to be set on nap at 11.30/12 no matter what time WU or he wouldn't nap.
If he won't CN then I think really you need to try setting the nap about 11am regardless of EW to try and balance your day.?