TIE fighters have no shields other than particle/laser shields like every little tug and space-bound cargo container. Nothing to defend against blasters, but possibly defensive against relatively weak laser-based phasors. If it were, it wouldn't be very defensive, but who cares. Star Trek ships still need to target agile little fighters that don't have set evasive patterns but extremely skilled and infinitely disposable pilots.
Two problems with your approach:
1) Fighting at warp (warp is FTL, a speed at which SW ships can't fight) won't work. you'll have miliseconds to target SW ships if you want to do fly-bys. By the time you've turned around and come back, the empire has jumped halfway across the quadrant.
2) Your judgement of their sensor abilities is off. Just like Star Trek (for instance, one of the last episodes of Voyager) there are some shields and techs that some sensors can't detect, and most of your evidence is from the under-equipped rebels, no less. Sure the rebels couldn't detect the specially-arranged planetary shields, and early X-Wings only detect weapon locks after they've been established, byt the empire did detect the ion cannon, but discounted it. They're bad about discounting forces they see as insignificant, but their weapons and sensor tech are built with of tens of thousands of years of warship development behind them.
Like I said, Trek isn't out of the fight, but you have to accept that they're going in out-gunned, out-manned, and out-paced. They need to rely on their abilities to build strong alliances, push their ships well past the stops, and out-think their opponents. And like was pointed out before, they also need to hope they get the empire, not the clone-wars era droid armies or the plucky and resourceful rebellion (or, god help them, one of the other SW universe superpowers, like the Chiss Ascendancy, the Sith Empires or the Yuuzhan Vong).
I DO want to be in the room when the Hutts and the Ferengi start bargaining for the scrap after the big battle, though.
Oh, and then the Daleks show up and exterminate everyone.