You want more bioavailability. This doesn't work the traditional way. The zinc ions actually have to enter your cells. If you do take ZnCl2, then simply eat with it and it'll absorb a lot better. Zinc citrate absorbs regardless, but it really shouldn't make too much of a difference. You'll probably be eating/have eaten anyways right? Give it a shot.
By the way, I don't know what type of zinc salt they used in the Yale study, I haven't read it in detail. I'll try to find a copy and let you know.