The problem with R6 is that iron sights and ACOG uses the same sensitivity setting, but they don't match each other in terms of movement. So you basically have to choose which one you want to match to OW, and the other one will just have to follow.
I would suggest using 360 distance matching only for hipfire, for scopes use Viewspeed or Monitor Distance. Since you have 38 on the Widow scope, this is the same as Monitor Distance 0%, so try this for your conversions.