Hmm. I don`t know this. Is that some kind of auto-aim? Because if it is I want it gone too!
I hate it when I think i`m doing well at something but I`m not really because the game is secretly auto-aiming for me.
Keep that with the consoles, don`t need it with my Mouse.
By default the bow is zeroed so that you don't have to know the distance to your target well. Most of the time you can just put your crosshair over a target and fire to score a hit.
With the tweak you've to always aim up and know the distance.
Add these lines to Skyrim.ini (or edit the lines if they're already there):
[Combat]
fMagnetismStrafeHeadingMult=0.0
fMagnetismLookingMult=0.0
f1PArrowTiltUpAngle=0.7
f3PArrowTiltUpAngle=0.7