yup they should hatch no issues at that temp. if it were a couple degrees cooler I would maybe be a tad concerned with possible development issues.

btw. I suggest using a mock tub to put your thermostat in. this way you wont get temperature fluxes due to your thermostat probe being in a box that has eggs that are creating their own heat. Also... this is where you can run into development issues.. if you incubate at 85 for their entire incubation cycle.. no big deal.. but if those eggs were incubating at 3-5 degrees warmer for even a week.. and than the temps dropped because your probe was in a box with eggs in late stage development... that can causes major issues. you want your temps to stay the same. this isnt as big of a deal later in the incubation cycle when the eggs are creating some heat.. but earlier on it can be. I'm kind of picky about this... once I have boxes that start to sweat, I open them up about twice a day just to give them a blast of fresh air and get rid of some of that extra heat in the box.