The only thing I would say is to take them off and do it again.
I had some issues with the timing belts on my 748 as it wasn't obvious if the alignment marks were correct or not ... they seemed to be slightly one way or the other based on a single tooth difference. I took it all off, reset everything and put them back on until I was happy it was right. It was the first time I'd done it so wasn't 100% sure!
It went round Brands without going bang so it must have been ok
