As strange as it is, I actually find myself liking regular DCs over DHCs in actual play after trying the two setups on an DHC Advanced Escort and a DC Mirror Qin.
With the DHCs.. the initial punch is impressive to see, but I often find myself.. waiting.. for the last volley to finish a ship off. Meanwhile, the health of enemy ships just constantly drains, from start to finish, while using alternating CRFs. There's very little 'wasted' damage, you just target the ship and watch it melt from a continuous stream of pew pew.
That said, the DHCs are useful if you want to multitask. The brief break between volleys means you're free to quickly toss a heal or debuff/control another ship without majorly disrupting your damage flow.