I use to shoot Easton Epic Raiders, 340 spine 30" at 70 lbs with a 100 gr head (Rage 2 Blade). The arrow was AMO at 425 grs. The bow was very consistent at both 20 and 30 yds. (I shoot a Bear Strike). I recently went down to an IBO arrow. The bow is faster since the new arrow is 72 grs lighter and I am now shooting at 5 grs per pound instead of 6. At 20 yards the faster arrows group just as good at the heavier Easton's had. At 30 yards my groups seem to be consistently left about 5". I would expect them to be a bit wider since my 42 year old eyes ain't that what they used to be. Any thoughts?????Is it just the lighter arrows are a bit flakier???? The new arrows are Harvest Time HT2's (The Harvester) and they are the same straightness as the Easton's, .003, in their arrow its a 350 spine and the length, vanes and broadhead are all the same. Has anyone had anything like this before? The bow ain't the fastest by far, so I thought the lighter arrow would give me more of edge. Maybe I should paper tune it? HHHEEELLLPPPP!!!! I don't have a lot of time to get this worked out. I am leaving for Nevada for Mule Deer next Saturday and when I get back, I go right up to Ostego for the last week of bow season.