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.
Who set it up?
Can you post pics of the strings at the machine heads?
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?