Thanks, Pro!
I love that scenrio you described. That would've been really exciting to see!
In "747", he seems to slow the Hulk out down but never actually reverse it. In that case, though, he needed the Hulk's strength but he also needed David's brain to land the plane. That's what made that episode so memorable. It was almost like David vs. The Hulk! Those kind of internal struggles are great, when done well.