2007 Denali/A.C not working like it should

[Tbh handyman]

I have a 2007 yukon denali the a.c in it does not blow very hard and it doesn't blow as cold as it should sitting in the front seats you can't really feel the a.c coming out of vents I hooked a set of gages up to it and the low side is reading between 50 and 55 as the high side is reading about 225 i replaced the pressure switch thinking that would help and still no change i believe what might of been the cab filter under the dash i tried to blow it out also I do live in florida so I don't know if it's the heat or what the problem is I'm not very good at a.c systems so any help will be appreciated

 

[Big Mama]

Same result whether using auto or manual modes? Does it blow more on heat setting? With a temperature gun what is the temperature from the vent?