I assume all the chokes fit both barrels? If so, the deer combination would be the 22" barrel with the IMP choke. (Getting a Cylinder choke would be good for slugs.) You could use the 28" barrel for slugs but that's a looong barrel and won't provide any real benefit over the 22".
The shells you have would certainly work for turkey. You need to pattern the gun and see how they work (with the full choke probably) so you know your limits.
Still happily answering to the call-sign Peetza.
The problem, as you so eloquently put it, is choice.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.