The CZ CUSTOM trigger job is a few hundred dollars right?
The parts are $221. I couldn't tell you how much it would cost to have CZC install them.
The take up and over travel can be taken out with shims if you trust gluing them in place. Or if you can weld small beads then file them down to make everything work like I did. I got rid of all the over travel and most of the take up.
This is the route I took, too and it was simple, cheap, and easy. I went the shim route and it's made a huge difference for about $20-$30 total invested (shims, jb weld, and springs).
I polished, too, but it really didn't make much of a difference.