Interesting thought about balanced cables out beyond 20'. I've never had a problem with 20' cables, but now that you mention it, that's a little surprising. It could be that all my guitars are really top end, with good shielding and proper installation of electronics.
Tell me, did you convert your amps also? That seems like a lot of work unless you were having problems. Lots of guitar amps have POS inputs, but the good ones don't give me issues. I think I'm with your boss, I wouldn't do it unless I had a problem that couldn't otherwise be solved.
The bass player in one band has constant noise problems with his Galen Kruger amp. Maybe I should suggest that he go balanced. (He won't take my suggestion and buy a good amp!!!)
About the George L's, they have two 1/4" plugs, so be sure to get the big one. The small one can be a little loose in some guitars. The big one isn't too tight in any guitar that I've tried. I agree, the G L's are a bargain, but they're a step or two down from the very best cables.
Dave