Put a washer above the bracket and then tighten a nut down on it or rotate the bracket till it sits flat. Then put on the front wheel and see how it looks. I trim fork steer tubes all the time to fit the bike the fork is going on. I have never used that brand of springer but I would guess it will work fine. When triming a steer tube run the upper race down the threads to the point where you'll make the cut, then cut with a cutoff wheel. With a sanding pad on a hand held grinder sand the top of the steer tube flat to the race and then back off the race to chase the threads. Before you cut the tube carefully measure your stackup with all the headset pieces so you don't cut too short. If you cut it too short it's scrap. Gotta run!