tramlining and tire pressures

[c4racer]

I was driving the 4.6is last night on a stretch or highway that was particularly bad for tramlining. Pretty annoying. I know all X5's the wider 19-20" tires do this to some degree, and the 4.6is is more of a worse case. I am runinng Yoko Advans with about 75% tread on them. unsure on alighment, but it was done when these tires were installed.

Anyway - driving that same stretch of road in my Audi with 235-40-18 tires shows no tramlining effect at all. But the X was pretty bad. then on another road that was smoother it was much better, so it is very much road dependant.

Are there tire pressures that will reduce the effect?

I am running 33-34 front and 36 rear currently. Maybe balance it out to 32 all around? Or is this effect more due to front tire than rear?