Re: engine moves to left
Your chain is way loose from what I can tell, I don't even see the tensioner on there. Make sure that chain is tight.
Try this: If you feel like you can't tighten the engine anymore than you already have, put some good quality m6x1.0 studs in the rear, and get a pair of good quality 10mm nuts, then tighten it down good. Don't rip the studs out of the engine, the threads are cast aluminum. Is the chain jumping? Is in line? This will rip the engine from it's place even on a solid mount if the chain gets caught.
My two cents.