Personally I run with 5 BHG turrets with a rear-mounted basic missile. The ship itself feels to fly more like a bomber than a gunboat, so I fly it light a bomber when fighting fighters.
When facing enemy gunboats, I stay at maximum range and rear fire with the 5 BHG turrets. Horizontal strafing allows a person to dodge most of not all enemy fire. Rear-firing is also effective when you find yourself alone against multiple fighter/bomber enemies. Both rear-fire strategies make use of thrusters.
I've actually tried the tri-pulse/razor combo before, and have found, personally, that it just does not work for me. While it certainly is effective in one-shotting fighters and bombers, as well as being effective for hit and run tactics against capital ships, I found it lacking in group fights where I was the primary focus of enemy fire. Since I could only shoot once every now and then, my enemies would constantly fire upon me, thus I was shot down in no time flat. With full BHG turrets however, I was able to scatter even a large group of fighters/bombers, thus being left with minimal hull damage post-battle.
In a nutshell: BHG turrets + 1 basic missile = effective against fighters, doable against gunboats.
Pulses/Razors = Effective against 2, maybe 3 fighters. Requires practice. Also effective for hit and run tactics against other gunboats, potential to solo cruisers.
