Wanting to fight the catnap starting around this time is very normal, but without it they do tend to get cranky. On the days he fights it and you can't get him to go down, may I suggest moving his bedtime up earlier by 15-20 minutes so he doesn't get over tired? This shouldn't make too much of a difference in wake up time the next morning.
The days he does take it, keep bedtime as is, and remember that the cat nap is a freebie so you can go for a walk, go for a car ride or even in your arms if that will help him get just a little rest.
Regarding moving to 4 hour EASY w/o a dream feed, I can't offer too much advice because we have always done a df. Consult your pediatrician to make sure dropping a feed is okay, howver, at this age 5 feeds a day is fine. I have read from other moms that don't dream feed that they do 1 of 2 things:
1. cluster feed at around 5 and 7 pm
2. let your lo wake up naturally and offer that feed (which usually ends up being between 10-11 pm)
so doing one of those 2 things would get you to 5 feeds a day.
HTH!