so my agile 3100 will not stay in tune no matter what i try to do. I replaced the tuneomatic bridge with a Gotoh then i got some Spervels locking tuners. the locking tuners did help but i still can make it through one song without almost everything string going out of the tune. I spend alot of time stretching strings too. The nut is supposed to be good, but u cant remember what brand it is. anyways it's pissing me off. After two set-ups and upgrading the guitar it still doesnt want to stay in tune.
Put some pencil shavings in the nut. It'll reduce string slippage. Also look into replacing the nut. I like TUSQ.
Try to properly string your guitar?
This post may contain my opinion and/or inaccurate information.

Current Rig:
2006 PRS CE-24
Mesa/Boogie Mark V
Voltage S212 w/ V30's
Strymon Timeline
CMATMods Signa Drive
TC Electronics Corona & Hall of Fame