Suspended Ceiling and Duct Conflict

Well, if the tin won't just fold up on me I feel it's worth the trouble. The T's are a thin double wall until they box out at the top 1/4" above the holes.
Ideally, I need almost 3/8" to be level with the house "I" beam, and that would remove the box plus a little more. That would put the grid at 78" from the concrete floor. Standard door heights are 80" I believe.

It's not an issue to attach hangers to the duct then?

BTW, I've moved the duct up as far as it would go already.