You've got way too much tracking speed for way too little turret. You can track a fast object, but your turret can't shoot anything nearly as fast. Drop the FC size down and lower the tracking speed. Similar to range, having a higher tracking speed than weapon speed doesn't really give you anything, and on fighters you can use all the tonnage you can get. Unless that is the smallest, because it seems like fighter FC's get boost to speed... in which case, bravo.
3k km/s is rather slow for a fighter, most people wait for ion or magneto for fighters, as they give more thrust and let you reach real fighter speeds. No much you can do at your level though, so meh.
Gauss is a great PD, doing very well against missiles and fighters, and can mess up a large ship if they get too close. If you have the speed advantage on your opponent, you can order your PD ship to move to an enemy, and they'll get into gauss range and start doing a little bit of damage in heavy flurries. After all, your PD platforms get 4x3 shots every 5 seconds, that's 6 damage with the 50% acc loss, and that's comparable to a laser. It's also pumping out damage every 5 seconds for as long as it's alive, no reactors to fuddle. So while your laser is recharging over 60 seconds, your gauss has taken 12 shots and delivered 72 average damage. That's some stopping power right there. If you saw the miniseries of the new Battlestar Galactica (the few prime episodes BEFORE the main series was syndicated) then you can imagine that Galactica's anti-missile turrets were gauss. You can pack a lot of them on and fire them fast, the modern flak cannon.
Of other note, how much maintenance have you put onto your fighter? You can get away with adding none. If it's just going to be out on short-range intercept then you don't -really- need any maintenance. 6.79 years on a fighter is... laughable, really. That's like... what the hell are you doing with a fighter that leaves them out for over six years? Especially compared to that 66 hour fuel tank. If you could shave weight on maintenance and (maybe) fire control, then you should probably add more armor. 1 thickness armor is pretty much there to prevent solar flares from scrambling your brains. Light combat vessels should always mount at least 3, and anything taking real fire should expect 5-10 depending on your doctrine.
Also just a ps: if your OWP is small enough, you may consider building a carrier to gather a group and move them, instead of tugging. And fighters on a planet need to be hangared, they don't appear to benefit from maintenance facilities. Luckily, you can design a rather cheap PDC of the "fighter storage" variety to keep your little ships out from the weather.