Ok, I've tuned my FC400 using paper tuning, walkback tuning, and shooting at vertical and horizontal lines. It is a tack driver with both field points and broadheads. The problem I have is, I can't for the life of me get them to group together. Last night I was gettng 4 inch groups at 70 yards with broadheads. I get the same with field points. Problem is, the groups are at least 2 feet apart at that distance. Roughly 4 inches apart at 20 yards. Field points hitting to the left of the BH's. I have moved the rest left and right, VERY slowly, (1/32nd of an inch at a time), and it never improves beyond this point. I have shot heavier spined arrows, and get the same result. Any Ideas? Thanks guys!