My balls usually are never on their hot side unless they just ate within the past 24hrs. I still give them the appropriate 89-92 hotspot though. I would bump it down a little if it's reading at 94 consistently. I keep my ambient/cool side temps at 80 without problems.
This will vary from person to person in terms of opinion, but with my feeders I consider a f/t "medium" mouse (maybe around ~20-30 grams, ie a "small" adult mouse) to be around the same size as a rat pup. Jumbo mice (ex breeders) may be more of a small rat weanling size, and mouse hoppers would be about the same as rat fuzzies, just IMO.
If he's on f/t and you plan to feed f/t I'd try f/t for your first feeding and see how it goes. I offer f/t to my new additions even if they were on live from the breeder. If you plan to feed live then try live, it's up to your feeding preference.