un-nerf the obeya to "nerf" the hvr if you really want to do anything.
As someone that has used the HVR a good bit - QS-ing, reverse QS-ing, and just sniping- cutting the damage to 750 won't hurt me... I would swap to an RSA if I wanted to QS (I already use an ACT).
The only thing that ever legitimately worried me was a pre-nerf obeya. it could actually deal enough damage to suppress an HVR and was accurate enough to do it at range.
They nerfed the obeya and the HVR became king of long range. That said, If it takes 5 obeya shots to kill someone, i'd make recoil start to kick in at much higher amounts at 7-8 shots so that would force a pause to "reset" recoil.