I'm not saying that you're wrong to create more powerful stuff. That's a matter of taste, and not for anyone else to say. I'm not criticising you... it's just that things like stats and Force rating really are at a premium in this game. If you change these elements, you're really affecting the balance of the game. Which I think you're finding out now.
Non-standard species, Breach on weapons that aren't highly-Restricted lightsabers or heavy weapons, PCs doing 20+ damage per hit... All that is going to destroy game balance fast.
If you're having fun one-shotting everything in sight (including Darth Vader and Palpatine) then there's no problem. But if you're finding it lacking in challenge, then I'd recommend starting again, and this time playing closer to RAW.
I'd be a hypocrite if I said I don't change anything... but any changes I make are fully discussed with my players and the ramifications considered. And I rarely, if ever, mess with gear or stats or anything mechanical. I don't use numbers for Morality, Obligation or Duty, and the game still plays fine without them. I don't use Conflict, because we play shades-of-grey game where the Force-users are meant to be exploring the extremes of their personality. These elements certainly change the feel and theme of the game, however. Nothing is without consequence.
It seems to me you're having what used to be called a 'Monty Hall' moment - the characters are too powerful and have overpowered gear, so the GM is having to ramp up difficulty beyond what the game imagines. That tends to just lead to escalation, and too often ends in silliness like having to bring out threats like Dark Troopers riding Cybernetic Rancors just to be a challenge. Or using some kind of broken ruling or situation to provide a fair fight.
Again, I find it helps to go back to the original movies. That's the kind of level I think the PCs should be at. They weren't overpowered Asgardian gods - they made mistakes, they could be overpowered or captured, sometimes they had to run away or retreat. I think that makes them more interesting than the overpowered nonsense we see later in things like Force Unleashed.
All stemming from the dude with the largest issue with the difficulty curve on fights
That tends to be the way of it. If one player has an overpowered character, ramping up the difficulty only then hurts the players who made normal characters.
Edited by Maelora