Funny thing about freon, I have seen it not do much of anything until there was a bunch of it in a system. If you have too low of a charge, you get no refrigeration cycle. Just the chemical sitting at whatever presure you get at its current temperature. Take a peek in the sight glass in the top of the receiver/dryer with the compressor running. Any bubbles (really little ones usually-and a whole stream of them at that)? R134a is such a little molecule, it sneaks out anywhere it can. Might be worthwhile to just add some gas and see if things change. Just keep an eye on the high side presure. Since I live in N. KY, I usually don't see quite as high of temps as you poor folks. Kinda have to recalibrate my brain for the presures I would see working on your system down there. Just upper 80s withtons of humidity here.