Since I went from mowing with a 757 to my 2520 with R4's last season, I'm on a mission to get a better ride while mowing.
I'm going to try the 50% reduction of tire pressures.
My manual states max pressures (R4):
Front 35psi
Rear 30psi
So I'll try 18 in the front and 15 in the rear. Also, my rears are loaded.
I'm not real confident that it will make a huge difference being the R4's have such stiff sidewalls, but going to give it a try.
The downside risk of course is that you roll a tire off a rim, which could be very sudden and BAD especially if it is the down side front when you're on a side slope.
I doubt that 18 or even 15 would be an issue though - - Please report back, as soon as you reasonably can.
If we don't hear from you again I shall assume the worst.