I use Bohnings Xcellerator string conditioner and have had great results so far. Over 2000 shots on one of the bows, and no cable wear at all. Just get a little residue every now and hten, so I clean the cables, then recondition them. As far as serving the cables there, it's a bad idea. The serving will act like a saw on the TRG, and eventually wear grooves in the plastic. Martin originally tried serving the cables there, and ran into that problem. Just keep the cables lubed up good, and you shouldn't have any problems at all. I think any of the "thinner" lubes should work fine. I originally tried regular old string wax, and the build-up was horrible. I recondition mine after every couple hundred shots now.
2006 Rytera Bullet X 60#---2008 Moab 70#
2008/12 Firecat 60#--- 2010 Warthog 70#
2010/2012 Alien X 65# 2011 Onzas 60 & 70#
2009 Warthog 70#---2009 Firehawk 70#
2010 Strother SR-71 65# & 2012 Strother Rush 65#
I hunt, therefore I eat. lol