On my 2017 Axis says 75 Front and 80 Rear on the sticker..... Are you sure you dont have them reversed?
Mine is based on the E450 chassis, I think the E350 has diff pressure? So check that as well.
I been playing them pressures over the last year or so and unless you maxing out your weights you wont need the 80 psi. I think some folks run 60 - 65 in the rear when unloaded for a smoother ride and then adjust pressure accordingly whe towing or maxing out weight.
I started at 72 / 72 then, 70/70 later I bumped it up to 75/75 so see if it made a diff on handling and MPG (I didnt notice any).
After I scale out I realized my front was within 500# of max weight and the rear was nowhere near. So now I been runing 75F/70R but for the winter on a warm day I will keep it around 75 - 77 in all tires while in storage. That seems to net me around 72 - 73 on cold days when I excerized the RV.
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, Fresh water surge tank, Black Tank Tornado flush, 4999 zip ties.