Okay. Jon Hebert was gracious enough to give me his few-month-old Hybrids (I think that's what they are) several years ago. I boiled them when I got them and they've been great. I've only been playing really heavily on them (very roughly 2-5 hours, about 3-5 days a week) for the last year and a half-ish. All of a sudden, last week, I KNEW that it was VERY much time to change them. The volume just dropped off and the tone didn't have any more "blossom". I have a trio gig in 4 days, and gigs all day long 2 days after that. I have a brand spankin' new Obligato D and G sitting here. I don't have much time to break thim in before Friday. So. Do I change the two I have? Do I boil the ancient ones, one by one, again? Am I going to have wild tone difference issues if I put two new strings on? Or rather, how bad will it be? If I do change them eventually, how long do you think it will be before I can trust them not to act like shiney twangy new strings?