concerning string breakage....
i have always changed strings before each and every gig ive ever played, and have never broken a string during a show except for one time....and that was the time i forgot to change the strings.
ive found that, for me, after i change strings and stretch them all out real good, i have about three hours of hard playing on them...
I've tried just about everything. I always run brand new strings before a show too, and I always break them about midway down the string's length, or right at the ball end, but never at the saddle..
I've also broke D'Addario, GHS, Dean Markley, and every other brand I've tried in the same place. I've also broke the strings in the same fashion when playing other people's guitars. But I also break them playing rhythm too.
Keep in mind that a lot of our songs have 2-1/2 step bends, like Buddy Guy's "I Smell A Rat," and even Hotel California has multiple big bends in it.
Here's a brand new Ernie Ball high e that snapped at the end of a four hour set during the last phrase of the solo in Journey's 'Don't Stop Believin.' If you play it like the recording, the last note is a 2-1/2 step bend at the 22nd fret.
I tried a wound.017" D'Addario 'G' string once, thinking it might be tougher. Nope!!! Broke this during the lead section of 'Hit Me With Your Best Shot."
Snapped high 'e' hear during first solo of 'Seeet Home Alabama" right at the 8th fret.
Sometimes, I play solo sections on the heavier strings when it's possible to get up there. My vibrato is very intense too. Here's a shot of my Les Paul, "Thing One," just before a recent level and crown:
Some rhythm evidence of sawing on the pickups...
And a post-set shot of Les Paul "Thing Two." Loys of pick dust and contact with the pickup too.
Honestly, it's probably bad/rough technique more than anything else.
Since I'm playing both rhythm and lead, I'm bearing on these guitars 4 - 6 hours sometimes, even with a one hour break between sets, that's actually of time on a set of strings.
So, what ive started doing is just switching from primary guitar (Fender Strat) to Les Paul at the end of the first set...
Then, I restring the Stratocaster during the one hour break between sets.
This seems to be working thus far...