I'm kind of going through the same stuff right now. I replaced the Evaporator line/Refill line then when recharging it blew a small leak in the condensor. So now my bro is going to fix it, because I'm so not paying $1,200 to have Lincoln fix it, assuming another leak doesn't form.
So my recommendation is go buy a kit that has dye in it. Also, do you know you installed the compressor correctly? Anytime you replace the compressor, you should also replace the dryer. You will also need to prep the compressor with the right amount of oil.