Most of the time, high oil pressure is the result of a bad gauge.
If for some reaso you actually do confirm that the oil pressure is up around the 100 PSI mark, you should start noticing the oil filter will grow. When you do an oil change, the old filter will be talle then the new one (providing same brand etc.).
There is a limiter on the oil pressure. It is the relief valve built into the oil pump. Unless you have a real nice pump, then there isn't much you can do with it. I don't think you can even really get to it since the spring cover has a pressed on plug in it.
As for your engine breathing, that has nothing to do with the oil pressure. You need to have your PCV connected and working properly on one valve cover (passenger side) and some other way for fresh air to enter the engine. This is either a stand alone breather/oil fill cap or a oil fill cap that has a hose that breaths through the air cleaner. This fresh air entry is also a bad air exit during accelaration when there isn't enough vacuum to pull the vapors out the PCV. If it can't breath, then the pressure that builds up inside (that little bit of leakage past the rings) will find a way out, usually the weakest seal. PCV is the first line of pressure reliev, breather is second.