Nap strike??

Stacey • Baby Boy 12/5/2015; Baby Girl 6/6/2018, tiebreaker due October 2020
Nathan is almost 7.5 months now, and is on a serious nap strike. Initially, I could still get him down at night, and for his morning nap, no problem. I have worked hard at sleep training/routine, etc. and he can go from awake to asleep by himself easily.
However, for the afternoon nap, he screams and arches his back. He starts the minute I sit in our rocker to start the bedtime routine. If I lay him down, he screams and screams and shoves himself all around the crib. Nursing is not part of our routine, but if I give in, it calms him, but does not induce napping!
Now he's started this at his morning nap!! 😱
His second tooth has just barely cut through and he is starting to work on crawling.
Anyone else dealing with this??