>>I run higher tire pressures than MB reccomends

As long as you keep the rear pressure higher, i.e., maintain or even increase the differential, then, you'll be OK. In some of their handbooks, MB even recommend some higher pressures for improving economy, but at the expense of comfort - still keeping the rears at higher pressure than the front though.

Higher pressure in the front tyres of an MB is plain wrong, and not particularly safe.

An MB is not like a front wheel drive Euro-box where the weight on the front axle is much higher than that on the rear - the pressure regime for those cars is different, again, for good reasons.