You also might want to check to see if you have the correct level of refrigerant in the system. You said you punctured it while doing your mod, then I would first suspect some of the refrigerant escaped and now your system is low.
Sometimes low amounts can effect the cooling ability, the compressor cant cool it completely because there's not enough 134a in the system. Any A/C kit can tell you what you have currently.
According to the service manual, R134a fill capacity is
1.6lbs. Here is a link of a pic of what the book says:
http://www.elcovaforums.com/forums/s...ad.php?t=42576
Hope this helps.