Wire too big for Victron charge controller

[nash_sailing]

Hey all, we recently installed some solar panels on our sailboat and are about 80% done with the project, with one small hiccup - the 8 awg wire we installed is too big for the 75/15 Victron MPPT charge controller, which can take 10 gauge max. We have a long run from panels to battery locker (~50’ round trip) due to awkward battery placement, so we can’t downsize the cable. I see three options: trim the strands to make it fit (seems sketchy), use a pin terminal (seems like it could vibrate loose) and upgrade to a 100/30 charge controller ($$$). Does anyone have any insight on this? Thanks in advance!