I got my first build running now and I am so happy (see pics). But it vibrates really bad. And I noticed that the engine is actually moving off center a little. I used the rubber in the motor mounts. But how tight do I tighten the mounts? If I make them super tight it will make the mount to compressed that they won't absorb the vibration (I think) and if not tight enough the engine moves. What the proper proceedure?