How steep is the ridge going down to the ravine? Is it just gradual downslope? If they're real steep i would setup on the ridge, if there is a flat ontop of that ridge, that would be your best bet. Especially if there are lots of whiteoaks in that flat.

I am hunting something similar, probably not as steep as you describe, but I am staying on the flat, its basically a small saddle between two ravines.