So been playing with a lot of DME ships, and have some recommendations and feedback.
The Tunguska description notes it's designed for sniping, and sniping capital ships specifically. But the -50% range effect of the monoblock construction ends up making it not even a mediocre sniper, but a bad one, and also means it can't stay out of capital ships weapon ranges. Or most ships weapon ranges for that matter. So it functions more as a mid-range brawler than a sniper.
Actually, that's a bit of a balancing issue with the entire line of ships as a whole. The range restriction disproportionately hurts larger ship classes, since larger ships tend to have longer average firing range of weapons. Perhaps you should perhaps consider a scaling penalty based on ship size.
Also, the range cap means AI-piloted DME ships will more frequently loiter inside the blast radius of enemy reactor explosions, and suffer higher losses because this. This isn't helped any by their inability to mount heavy armor to help absorb some of the blast damage. I would consider adding explosive damage resistance (or whatever damage type reactors do) if you're not going to reduce the range penalty for their ships.
One last thing. I'd love to see some variants of the various freighters/tankers without a civilian-hull mod. I really love them as ships, but the hull mod's sensor/detection penalty is such a major drawback I usually end up using vanilla pirate freighters instead. Maybe consider creating non-civilian variants with lightly lower capacities? (It especially seems odd with the Puddle Jumper, which is a civilian craft to begin with, but has an export-friendly version? As if they're trying to keep civilian-grade technologies out of the hands of other factions).