Dont get me wrong, I think the P-47's as a whole, and the N in particular kick arse, but I dont think it will upset playbalance. I'd be quite happy to meet a P-47N in a G-10, D-9, or a 152, they can hold their own if flown correctly. Most people would take the P-51, Spit 14, or Tempest in this set instead of the N I would guess.
The way to handle this as I said before is just say:
"This week we feature (plane w and x) vs (plane y and z) and we will use (xx map)"
That way you can hand pick the best matchups so its fun for everyone instead of a very finely focused time period which leads to "oh, that plane was not there yet".