Jack Plate or Not?

[macojoe]

With a 29" set back bracket, would adding a jack plate make it just to far from the boat for a motor?
The reason I ask this is that I have seen a few ok deals on 30" shafts, and that would be great to get the power head up out of the water better.

I see that the jack plates are a set back of at least 5" so that would be 34"

So what you think??