martys–in book publishing that is considered adjusting the space below the head. Space is only adjusted above. By using that baseline shift the space below the head is being changed.
When I have heads fall at the top of the page, I have my style sheet compensate for it by using a white rule above (or color none). I might make it a 2 point rule above off set by 12 points (being sure to check “keep in text frame”).
That way when a head falls at the top of a page, the unseen rule above will push everything down so that the first text line following the head is on even-lines (i.e., lines up on the baseline grid).
Are you trying to have your head sit on the baseline grid? Normally, at least in book publishing, the head itself doesn't need to sit on the baseline grid. It's the text following that needs to. I've had jobs where the head (and text following) had to be pushed down 1/2 line.
Or am I misunderstanding?
doc