A fret dress will correct the issue, If you do need frets replaced ask for a harder fret, they do come in different harness. Also your guitar should be able to have the frets dressed a couple of times before any replacement needed - a partial fret dress should be $60-$80. And a good shop will correct the set-up so it will play as good as new again.

With all acoustic guitars you will have an issue with feedback if you face the amp. The Acoustic guitar body is designed to amplify, I suggest a silencer, a plastic cover for the sound hole, also turning the guitar pick up down. If that is an option, use very little pre-gain on the amp. This will get you a cleaner sound which will be much louder than you realize. I have been a musician for over 30 years and congradulate you for choosing one of the finest acoustic amps available. Yorkville does make the best sound, roadworthy product!