I’ve uploaded a b7 version (This will be the last one before it goes final - honest ;)), fixing the following -
Bad fps in certain areas - optimised with some more hint brushes, has made a 40-50% diff in some areas 
Added an alternative route for allies from initial spawn
Added an alternative exit route for the grail half way up the spiral stairs.
The allied CP area has been changed to a bombed out building (now blocks the long line to the cloister which was a real fps killer). Can go inside the building between that area and the flag.
Re: the black artifacts, I’m getting a feeling it might be a problem my end, as no-one else I’ve spoken to has reported them 
Can anyone testing please update to this new version - thanks 8).
Macbeth - how is it playing on your server?