I may very well ditch the PD and just run the Conquest as a dreadnought, it'd certainly save me a lot of OP. I do disagree on the MIRVs though, I've never been impressed with MIRVs, and in my experience, with my 'question mark' maneuvering tactic, I spec my Conquest to cripple or kill in the first pass, and for fighting something like a Paragon, having eight sabots slam into shields is often what's needed to put it over the edge.
Recently I've tried using Gauss Cannons instead of hellbores and heavy maulers instead of drivers, but I'm not sure how I feel about it quite yet. I'll think about what you said about the vents versus capacitors, maybe try it out.