About a year ago i did extensive test with unmaxed Maddox IV by killing over 6k Eviscerators (better part of the Evisc 10k mission).
I believe my blp dmg and pistoleer hit at that time was around lvl 65, which according to Entropedia gives us a whooping 2.66 dpp:
Somewhat higher dps comes from sga amp and 5 dmg enhancers, but still dpp is what it is. Despite all this my returns were consistently higher than using a maxed 2.96 dpp setup (Songkra+VI).
I don't
know the reason for this peculiar effect, but i have a theory.
Evisc stands out with its extremely high regen rate which in combination with its relatively low HP creates a unique situation. Whoever has tried to use a finisher on evisc knows, it usually fails. By the time you switch weapons the mob has already gone into the next regen cycle and if this happens the finisher dmg is not sufficient. You are forced to switch back to the main weapon to finish the mob off.
As a result you end up using your main gun all the way, no finishers. This situation clearly favors high fire rate/low dmg weapons and puts all low(er) fire rate/high(er) dmg weapons at disadvantage.
Evisc's low HP in turn amplifies the effect described above even further. Compare:
Evisc. 01 (L23) - 920 HP
Rext weak (L22) - 1580 HP
As u can see, the difference in HP means with the same ammo/decay spent you'll have about 1.7 times more "end of mob" events. This amplifies whatever positive or negative effect it entails for you, even further.
Alas, this is just a theory. I can't possibly know if this was the deciding factor behind my unusually good returns. Hopefully it at least serves as an example to show how many factors actually play into the final result, factors that usually remain unnoticed.