There's really no point to mod sandbagging once a GAC starts. The only thing that overall GP affects is which division you are placed in and then that's locked for the rest of the GAC. Matchmaking only looks at the top X number of characters, depending on how many teams you have to place on defense. So there's zero point or benefit to de-modding bottom half of the roster characters which aren't used by you in GAC....and taking mods of characters you actually use would result in you have to use those characters without any mods during your GAC round. That kind of thing worked in the old original GA format but has no benefit these days.