If it is restricted, chances are high it will be at the captube end that you brazed, or in the filterdryer. You really don't need to remove the evap.

I would add it through the low side, that might be your problem. It's more dificult to add through the high side.

Yes, liquid freon comes out of the high side if I push the valve.
I've added an entire can of 134a (12 oz). Some has leaked out. It is supposed to hold 6.5 oz.
Where's the captube? The evaporator has 3 solder connections: to the compressor, to the condensor, and there's a small tube (hot gas).

I don't see how I could check for clogs without removing the evaporator.

if you have added that much freon and it still pulls into a deep vacuum it is definitely restricted you need to isolate the high and low sides and with a process tube adaptor You blow nitrogen through it and depending on how long you left the system open it could be contaminated with moisture. flush the system real good with Nu_Calgon R11 Flush, Then flush both sides with nitrogen I would replace the line drier and then put it in a vacuum for at least an hour. Then recharge it

Sorry to ask, but how do you "isolate the high and low sides and with a process tube adaptor?"

I only have compressed air. Will that ruin the system? I'll pull a vacuum after I finish.

I didn't check the evaporater for clogs before I installed it. Are they ever clogged from the factory?