I hope I get this thing figured out too. Yesterday, I ran into a tech I used to work with and I trust him. We had a long talk and the Jeep was with me for him to look at. He use to work a at a Jeep dealer and knows these systems fairly well. His gut feeling is the radiator but sees the condensor being a possibility too, especially when I told him that it blew refrigerant out when I bypassed the high-pressure switch. He's doing some research now and we may just do an evac and recharge at his shop just for preventative to see where we're at.
He thinks if it's the radiator, it's likely on the end of it's life or just plugged enough to operate cooling system, then on a hot day, the heat from the condensor puts the radiator out of it's capability and all these symptoms occur, the radiator then gets hotter which makes the condensor hotter (next to each other) thus increasing the AC pressures and both systems start acting up. The only thing leading him away from the condensor is that AC cools fine when it's not as hot outside, no issues at all. He also finds the whole thing very strange that when revving up the engine, all issues go away and everything is fine. Driving me nuts! Both parts are not cheap and very labor intensive, that part sucks too.
Here's a pic I found online of basically what needs to be removed to do either (the radiator saves a few steps), along with a winch, grill guard, and lights on mine. :grayno: