K'vorts are not great vessels to use unless you are in a squadron for cover support. You are right that K'vorts are a tad underpowered and need too use cloaks more often (If they can). I highly recommend using other hulls like D5/D6D7's as their hulls are more balance on systems and they have great firing arcs in most directions. People who play GAW make a mistake that you should "Close and Hose" the enemy with Klingons, this is an unwise tactic in GAW. GAW Klingons are suppose too used at Medium range and wear down the enemy mostly with disruptors. You can still close in and try hitting with Alpha Strikes at point blank range, but timing is everything. Also, don't be affraid of targeting subsystems with your weapoins. If you see a Rom with a Heavy Plasma and one of his sheilds are down, consider sniping at a distance at that system or hit his warp core. Klingons have an advantage here with their fast firing dizzies and most GAW Warp cores are not designed too take a lot of hits. If you even partially damage their Warp Core, their is a good chance that he will have less power too run certain systems.
Like I said before, don't be affraid of the old D5/6/7, they are still very useful hulls.