Ac pressures and temps weird

[KobyG]

Got a weird one and I’m pretty stumped, 2015 Tahoe Ltz Brand new ac compressor, condenser, and front and rear expansion valves, where it gets weird for me at least is when just the front is on pressures are perfect 45 low side 220 high side, as soon as I turn rear on low side goes to 55 and high side will usually go down a little(205-215). Refrigerant charge was weight in, also with scan tool connected evap will sit at 45-48 degrees, then jump to 55-57 once rear is turned on- outside temp was 92*f