150psi per cylinder is a good sign there is no problem in the headgasket between the coolant journals and cylinder chambers.
If it holds compression then i doubt it has a blown gasket.

Now on the other hand the icing up vaporizer/regulator usually means the coolant is either low or not going through it and you should investigate that part of the cooling system that goes through it. It is either clogged up or some internal problem not allowing coolant to flow through it. There may be a slim chance that coolant may be leaking through the diaphragm and getting into the fuel system which is why you smelled antifreeze coming out of the exhaust. You can try to rebuild it but the best bet is to just replace it with a new one and eliminate the risk of reassembling it incorrectly and having to redo it.

As for the excess amount of condensation coming from the exhaust? i've seen this many times and yes it has something to do with the temperature of the muffler/catalyst and exhaust exiting the system, it will generate moisture until it gets warm enough to evaporate it and normalize the environment inside the exhaust.