I understand serving a 'bump' on the string; but, he specifically said "... is it ok to use serving thread to tie a nockset directly on the string..." The mention of a nockset caused a caution light. Sorry.

As far as shooting with both eyes open, much better for hunting in that it gives you more depth perception and has other qualities. You must, however, make sure you have a very dominant sighting eye or you will have to close the other and learn to open it slowly to avoid shooting off the target.