Gas Rerouting is a much more sensible alternative choice of overclock for the GK2. You can mod out the recoil with Tier 3A and get the fastest reload speed possible with Tier 1C. That's what I use in this loadout of mine: https://karl.gg/preview/17077#/

Also, shouldn't you have the "Power Attack" mod on so you can even use it anyway? Just pointing that out.