I’ve been melting preds with the QR-4 even with silencer and no extended mag.
All FT weapons deal a lot of damage. None of them need buffs and if anything, most of them need nerfs.
You can’t have weapons that have little to no recoil, fast firing rate and fast reload animation deal a lot of damage. There are compromises on each weapon to suit your playing style. You need to adjust.
You want a QR-4 with more damage? Use the hammerhead… is essentially the same weapon with higher damage and a bit more recoil