I haven't looked at his splits, but Radke gets hit just as much on the road as he does on the turf at home.
The Twins infield is quite adept at making plays on that turf, so that isn't a great excuse.
The longball is what is killing him. He can get out of jams where he gets hitters on base, as he has for years on end. But giving up homers, there just doesn't seem to be a fix for that.
The twins just have to live with that and give him the run support he needs to get the wins. He rarely gives up more than 2 or 3 runs a game. If you can live with that and bank on a promising twins offense that is off to a slow start, radke is worth the very low risk.