cant speak for other tutors but when I mark papers I am trying to see reasons to increase the grade rather than catch folks out - the marking grid is the key arbiter
Also, hopefully true of other tutors too, I would never give a mark at the top of a grade boundary (ie a 69 when 70 is distinction). Its common in my Uni to only allow three numbers: n2 n5 n8, so a 42 if its a weak pass, 45 if its average, 48 if its solid
Word count is an interesting one, technically we are supposed to stop reading when we reach the word limit so as not to advantage the over long paper