>We have a droid heavy marauder outlaw tech.
That's your problem right there. Rings all kinds of danger bells.
Actually, this system is easy to min-max, and it completely goes against the themes of the game.
Now you could just start a war of escalation, using Breach weapons like lightsabers, anti-droid ion weapons, etc... But ramping up the danger just for this guy will just get everyone else killed.
I've done certain things in my game that's likely too harsh for most (no out of career multiclassing, no armour for anyone) to keep the themes of my game intact. Being shot with a blaster should hurt anyone, right?
So I'd just sit him down, tell him you're unhappy, and suggest he play something else. Congratulations, you've 'won' the game, now do something different that doesn't look like the love-child of MechaGodzilla and the Death Star.
Star Wars isn't only supposed to be about combat. That's just a part of it. Realistically, you should be challenging all six stats, not just Brawn. Anyone with a 1 is asking to be hurt. There's fear checks, etc, and general out of combat stuff. The players should regularly be in a position where fighting isn't their best option. Social tests, sneaking, chases, vehicle combat etc should be a regular part of any Star Wars story, let alone non-stats stuff like difficult choices and moral decisions. This isn't 40K here.
With equipment and gear, remember that YOU control these things. This isn't D&D3 where every player gets level-appropriate items. If you're giving them overpowered weapons or gear, that's part of the problem. The rules have checks and balances like Restricted, Rarity, price, encumbrance. In most games these are handwaved, but in this one, enforce them. Nor should they be romping around with heavy or illegal weapons without stormtroopers or the local crime boss calling them to account.
Explain that there are 32+ skills and a character will be challenged on most of them, that a wide spread of stats and skills will be required in future. We've been playing regularly for two and half years and the characters are still mortal because they grow outwards, not upwards. Heck, I myself have a 1000+ XP GM sidekick character who would be outfought by a starting Droid Marauder.
Don't play the game like it's Pathfinder or D&D 4E, with everything maximised for a combat only game. Talk to the players, explain how you feel, and challenge a wide variety of skills and talents. And if nothing else, go back and watch the original films, where you'll see that running away and being outgunned happens frequently to our heroes.
For me, 'Star Wars' is as much about all the other stuff that happens outside of fights.
Edited by Maelora