Break it in first. I've had almost a dozen 85's now. They all work better after flushing out the bolt nose, blowing out the extractor area with compressed air and oiling with a light viscosity oil. I would clean the bore well and clean between groups on your next range trip. It may settle down. You may try waiting longer between shots too. Could be the reason you're seeing shots 4 and 5 walk is a hot barrel.
