AI can be fooled.
People less so.
Guys that fly drone ships think they're invincible against a ship with lots of plasma to charge, but that's not really true. Avoid using "non wartime optimized" ships like the NCM or BCE or you'll find your proxies don't do enough damage, especially with the fire spread between fore and aft. (Vs. Klingons on the other hand is another story.)
Now, that said, if it was me, due to the KHK's lack of the excessive D plasmas found on the KCR fly a BCV, and use light fighters, then try to pick him apart at range. Proxy photorps followed by bombardments, keeping speed up. Your fighters's G phasers and mini-drones may give you just enough opportunity to get some good punches in. However, the KHK has superior turning arcs to any Federation CC or BC series ship so staying behind them is risky at best, and an experience player will probably find a way to make you eat plasma that way.
I'd also like to point out that just because you hit and run a plasma hardpoint doesn't mean it stops working. If your R tube is fully charged, and it winks out, there's a short window of opportunity where you can still fire the torpedo! So don't pull a frontal if you just ran a hit and run on their heavy weapons because they might still fire at you.