Yet the corrosive buff do not stack , it does not work on shield , it have a short effect timer, have to hit.
I dont think you take all of these in consideration , it's like thermal vent , on paper it does not incrase your dps , but in real fighting situation it can makes you fire so much longer that it's a nice increase.
Also , corrosive are quite useless against shield tank.
If you want raw number on hit , railz with the anti SCB thing are the most powerfull weapon since they can negate about 500 shield in one hit ? (dont know the numbers tho
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This just show that elite weaponery is very situtational . Also i'm using corrosive shell quite alot , and it really dont feel like it's a 1700% increase =).
So if it's just +25% on only hull , considering the hulltank problem of stacking HRP + engi , is not that bad.
To me on of the real problem is defensive items are stronger than weapon when you engi them (because you can stackthem a bit to much) and this result in a way slower TTK on many ships.