I have Richardsons ground squirrels here but they are easily caught in #55s or those small round body grips WCS sells. 110s should work fine if that is what you have. Maybe you need to put those fine wires between the the trigger wires so they can't slip past. I have a friend in western Montana that does Columbians and all he uses are small body grips and tube traps. I also sent him one of 330trappers ground squirrel cages and he said it worked like a charm, he caught four at once while still setting the job up. Try and look up Lee's Trapworks out of Canada, they make a metal stamped spring loaded trap with a guillotine kill bar that's very effective. Also consider burrow fumigation, I can fumigate an infested 5 acre field in a day and get 95-100% kill, of course you have to be licensed to use fumigants.
There are some real thin skinned folks around here. I'm not one of them.