Yes, the VQ kit improves the trigger pull weight and feel. Apex and Tandemkross are also good choices. Unless one of them offers something specific the others don't (a particular color or trigger shape for example), my preference would be Volquartsen, Tandemkross then Apex.
Correct a Ruger MK series lower is unserialized. The kits aren't difficult to install but I find parts of the process fiddly. That could be related to the way my hands and fingers work (or don't work at times) though.
FWIW THESE make for great, cheap snapcaps.