How long until bottom Clear Correct tray stops cutting my tongue?

I am on tray 1 day 10 of Clear Correct aligners. The bottom tray has made my tongue bleed every day. My dentist filed them and indicated I was on my own with a nail file for the rest. The bleeding continued, (I am a teacher and I talk sometimes for 4-5 hours straight and the bottom tray fills with blood), even after I cut the edges back with a cuticle scissors and filed them with 1000 grit wet/dry sandpaper for auto plastic. Is this part of the process? I didn't have braces as a kid.