I'd suggest using a card to block the light at short test-strip like times (and use the f-stop system), I thought this was standard-practice, and also please consider the under lens Multigrade filters to simplify so much of the struggle you are going to meet printing in a different way to almost everyone else.
There is no tolerance period. It must be perfect. This is the last step in the chain so why blow it now?
Mine was off 5 deg right out of the box. There are clips on the back side of the head so you loosen them and reposition.