Play with the tension on the forearm screw for starters. The #1s in sporter configuration often have groups that climb because of the angled screw. May #1s were varmint barreled, but I had that issue on my #3 and finally bedded the forearm. Some guys had had success putting an O-ring between the forearm and the screw. Free floating will probably help, but you have to bed the three contact points of the hanger to take all contact off the barrel.
