A couple of things to look at in this regard. Adding washers to the bolt head side may block the groove/hole in the banjo fitting, that is the hole in the bolt and the groove on the inside of the copper sleeve. Second, you're correct in presuming if the bolt bottoms out, there may be no sealing of the crush washers. I'd screw the bolt in to see where it bottoms out and add the crush washers to insure it doesn't bottom out and just have one crush washer under the bolt head. Again, if that doesn't work, you're looking for another MC. Give Gil or Dennis a call at OGTS and see if they have a new, or used MC and you can rebuild it. They did that for me one time, and I ended up with a euro MC with no chamber under the main bore for the brake failure switch contact, but it was no big deal, I can sure tell when my brakes are failing.
