2002 Honda Accord V6 282K Automatic

To check for a leak, I pulled vacuum with a pump and using a manifold gauge. Disconnected and let system sit for about 8hrs. Reconnected gauge and system still had same vacuum readings. To check for blockage, I pulled vacuum from low side, and lost vacuum when I opened high side. Did the same for high side. To check low pressure switch, clutch didn't engage when system was empty. I pulled vacuum to ensure there was no air in system, then I charged with 1 can of only R-134a 12oz. The compressor clutch engages and condenser fan runs when ac is switched on. When I disconnect the low pressure sensor switch, the clutch and fan stop. The manual says capacity 15.9oz to 17.6oz OR 21.2 to 22.9oz depending on my condenser, so my 1 can is low but it is enough to exceed low pressure switch and engage clutch. Doesn't even blow cool air with 1 can and clutch engaging. Blend door works. Ambient temp is about 90F, engine warm, manifold pressure gauge shows around 100psi on both low and high when off. When on, clutch engages but no pressure change. Low doesn't drop and high doesn't rise. I'm leaning towards a bad compressor. I could add a 2nd can to bring up to spec but I don't want to waste it if that's not the issue and a part needs to be replaced. Especially since the clutch engages already, I feel like there should be at least slight cooling. I would prefer not to replace the compressor and find out it's the evaporator core and expansion valve. Your thoughts? Thanks in advance.