Tire Pressure

I would appreciate some input on tire pressure for an 05 Bounder DP that uses 275/70 22.5's. I have new Hankook's on all wheel positions. The Fleetwood label says to use 90 lbs. and that is where I started.Our MH was loaded today and I was lucky enough to find a scale where I could weigh one side. But not 2. Loaded the FA was 7500 lbs. and the RA was 15,820. If I were on a long trip probably would be about 300 more on the rear and maybe 100 on the front. Full fuel and full water. When I weighed one side it was 3500 FA and 7620 RA. If my math is correct I would call the FA 4000 times 2 or 8000 lbs. ( 7500-3500). The RA would be 8200 times 2 or 16,400(15820-7620). According to my tire chart 85 lbs would support 17640 on the rear (8820 per side) and the front would support 9570 ( 4785 per side). I hesitate to go to 80 lbs. as that is the minimum pressure for those tires. Any thoughts? I want to run lower pressures as the unit rides a little hard. I have new Koni's but have not installed them. At 90 lbs. I used my laser thermometer and the temps on a hot day after driving at 60 mph were fine. Any input appreciated.

Moisheh