There really are days where it seems like nothing will go your way, but I think that gives you "one in the bag" for a day that will go perfect. I feel your pain with the flywheel nut, the last 3 motors I've built have had 3 different sizes and none of them stock. I have a drawer full of giant sockets now.
I think adding a little bump to your car is acceptable ballast for a GL
You need to have something in the car that's louder than the motor right?