Yes, not only was truss rod was maxed out (which I had been trying to be ok with) but then neck was slowly bending, raising the action too high for me. The difference in string height was actually enough to make an audible difference to the tone, as the strings were taken higher over the pickup. And that was with a set of strings whose total tension was lower than a standard 45-105 set of Rotosound or GHS rounds
I've got heavier strings on my LB-100 (45-105 Chromes) and the action on that is an absolute dream, no problem with that truss rod.
I like to pretend that they've already made the new neck and are letting it sit there for a while, to be sure this one works.
I've forgotten the exact figures, but roughly speaking sending the bass from UK to US and back again will be costing me $500. I also spent $125 on a new hard case, as I didn't trust the G&L case to take another 10,000 miles without it showing.