I've made 3 ships so far that aren't super duper powerful.
The first is the Actation

Two gatling blasters, 3 flak cannons. Heavily armored despite it's small size. Can take a good whalloping before being destroyed.
Then the ActationV

Two gatling blasters, two of whatever those cannons are called, 3 flak cannons. It originally had 5 flak, and I think a couple extra guns maybe beamers but I removed them to make it less OP. The sides are just as heavy as the Actation's and then the extra bits are armored too.
Then finally, the beast of a battlecruiser. The Dracon.

Eight front blasters, two front gatling blasters(clipped over the aegis shielding for some reason), two front mega beam things, two EMP missile launcher things, two blasters on each side, four rear blasters and two rear missile pods. Also has like 4-6 flak cannons, i can't remember and then 6 aegis deflectors. This thing can take a MASSIVE pounding to the front, but if attacked in the rear it will go down quickly. I pitted two of these vs 6 ActationVs and it was a long battle with lots of flak explosions but eventually these won. I just had two of these vs one of every standard enemy ship and they won. These things are beasts. I tried seeing how it did against one actationV when it was facing away from the V and the ActationV won