Am I missing something? Slug accuracy = terrible!

Been working on a slug gun in 22 cal for a while now. Got it out to 75 and got discouraged again lol.
Welcome to the club. I'm thinking about doing something really stupid, get a Maverick VP .25 and start messing with slugs in it. My other .25 VP just drills pellets 33 gr and down, just turn the HSA and shoot, my .22 compact is now doing the same 18.13 or 16, just drills them. I'm trying to find the exit to that darn slug Rabbit Hole® But I do love a challenge.