these aux cannons are only gonna be good on a ship that would run more aux then anything else anyway. the vesta with its cannons can forgo weapons power completely, have 2 chono mines and a beam array aft and dump everything in aux, so its abilities, heals, and damage are as strong as they can be at the same time. DHC are the least drain-e of all weapons with the way they fire, they arent even going to hurt your high aux up time all that much.
I had that exact same thought when talking about the Vesta to my brother last night.
That said folks, if you want to run high-weapon power, you can. There's a few Science (!) powers out there that don't rely on aux at all (VM and the suddenly ubiquitous TBR come to mind). In a 2 Aux2bat setup with a pocket RSP 2 or EWP 1 you can get a ton of crowd control without needing Aux... and oh yes, there are Danubes, too. Seriously, I've seen acrobats less flexible than this ship. :/