What about having iron condors on both the TNA and TZA as a hedge against each other?
Though TNA & TZA are hedges against each other; you dont want to put ic's in both. Think.. the worst case scenario for either of the ics is a big movement. And when that happens in one it happens in the other just in the opposite direction. So you will get double whammied. Just pick one; its doubling up.
Just pick one -and you can skew it to express your directional bias one way or the other; or the lack thereof.
-gariki