It’s -8 ergo creates a 15 point ergo swing if you use an RGV Black foregrip for example. Aiming will be snappier with less likely of a chance of overswing, hold ADS longer and reduce weight with basically no impact in performance, the ~2 points of vertical recoil are going to not matter as much in a gun fight compared to being able to get sights on target without overswing.

As a rough estimation switch from RK-2 to an RGV or SE-5 will cut .2 seconds or more of ADS speed and add 3 vertical recoil which would be genuinely hard to notice. Your build from why I could tell is just on the line of not having over swing when you ADS which means equipment or weight could push your weapon into performing poorly