Currently, the game sprays you with a firehose of point defense chainguns and point defense lasers. You don't need nearly as many as it gives you. It also gives you a TON of anti-fighter turrets, which you need even less than PDCs / PDLs.
I looked through the script for weapon probabilities, and p for point defense chainguns / lasers is 1. It is 2 for anti-fighter turrets. I'd suggest reducing it to 0.25 for each. I think you could even go as low as 0.12 for anti-fighter turrets.
Also, would it be possible to make it so that legendary PDCs / PDLs / Anti-Fighter turrets don't drop from enemies? There's nothing quite as annoying as getting excited about a legendary weapon dropping, only for it to be an Anti-Fighter turret.
I made a mod that does all of this, but Tengu commented that it would be nice to see this in the base game, so I figured I'd toss it on here.