If you’re fermenting at the higher temp you’re going to get a lot of esters and funk from the yeast which might clash with the higher IBUs. Plus the (presumably) lower FG with the saison yeast is going to put you in the 8% ABV range making for even more noise. If I was trying this with a kit, I would ask for the grains to be separate and drop a lb of the base grain to lower the ABV and I would put an oz of Centennial at FWH and the rest at 5-min and FO, 50/50 split (and keep the dryhop) in order to lower the IBUs while keeping the hop character. And if I had to ferment warmer, I would chill the wort down to ~60F (or even a bit lower if possible) before pitching, then let the temp rise.