AC not blowing cold

I had a shop replace everything on my dual A/C (front and rear). Only thing not replaced was the two long lines along the frame going to the rear unit. Completely cleaned the whole system with new condenser, compressor, switches, both evaporators, both expansion valves etc, pressures and Freon are at correct levels. I was hoping to get some further advice. They suggested I add a second condenser pusher fan to ensure proper cooling of the condenser to aid in a colder liquid heading to the cabin. But before I go and fabricate a second fan on the front of my Sequoia, will this help? My Limited Sequoia has both a thermal and a small stock pusher fan(s) They are the original fans and seem to remove some or a lot of heat (180 degrees in and 100 degrees at the back) already. Freon is not cold on the suction low side and my compressor stays on. Sight glass is telling me the levels are right. Couple more things; when I run the front AC only, the suction line near the fill port turns icy cold, but still just 70 degrees on the center vent on an 90 degree day coming out of the front. I then turn both systems on again, the rear seems colder maybe 55 to 60 degrees but the low side pipe gets room temperature. Again I have not seen any temperatures from center vent below 60 degrees. Freeway speeds seem to drop the inside temperature some, but not very much according to my analog gauge. Help please. Thanks, Robert