Newbie tuning question

[PSUBowhunter]

I am trying to tune my brakenbury drifter with carbon arrows. I have tried about every spine arrow I can get my hands on, with every weight combo up front, at all diferent lengths. Tonight I tried building my strike plate up and walla, I was able to get it to tune up. If I do not build my strike plate up, the arrow sits perfectly at center shot. Can some explain to me why my bow shoots better about 1/8" out from center. And is this to much to build it up. I used a golf tee tonight.

[Hot Hap]

I believe it allows your bow to shoot a lighter spine arrow. Hap

[Bjorn]

It more than likely shoots better built out because it takes heavier spined arrows due to the mount of cut out on the sight window. 1/8" is not too much build out. I had that much and then went to stiffer arrow shafting.

[wtpops]

How far past center is the shelf cut? Is it at center? If it is cut past center say 3/16 and you put a 5/16 arrow on it the center of the arrow will be past the center of the bow and will cause tunning problems. I am not an expert just my own experance.