| Front-rear tire pressure considerations
Sorry, Jayhawk. I was typing while your newest note came in, but here's my reply.
My understanding is that a softer (lower PSI) tire will break loose sooner than a harder one, all other things being equal, and that this is because the softer tire's tread will squirm and start lifting off the pavement sooner than the harder one. I'm talking about street tires here, not drag radials, which are intended to flow around and into the texture of the pavement to deliver more than 1 g acceleration (and whose sidewalls wrinkle like cellophane).
More pressure is good only up to a point. A seriously overinflated tire will lose traction because the center of the tread will bulge, taking weight off the edges of the tread. Making the tire harder also ask more of the shocks to keep the tread on the road, rather than bouncing. This is even more serious if it's the front tires bouncing, because you then lose steering capability as well.
Meanwhile, M-B always tells you to put more air in the rears than the fronts, despite the fact that the front tires carry more weight in at least most models. Tire makers in turn follow car makers' recommendations very closely.
Swapping the F and R numbers you report would be in line with M-B's general approach, and with what both theory and experiment suggest to me. Going to 33 f and 36 r should give you more balanced handling and less nervous steering.
My experience under controlled performance-driving conditions (in the other car to which I refer from time to time) is that I'm more likely to experience oversteer if I don't put up the rear pressures a bit relative to the front.
Powerful RWD cars whose power gets used wear the rear tires faster than the fronts (even the 4Matic cars apply more torque to the rears, and I've observed more tire wear at the rears on my car). Having a bit more pressure in the rear will moderate this differential wear a bit. Again in my experience, letting the rears get soft in a powerful RWD car results in more squirming and wheelspin under hard acceleration.
Sorry if this doesn't add up to a hard-and-fast commandment. All I can do is share what I know and understand; the choices are yours. | 
