Go with Imp Mod if you want, I dunno that it will add any practical advantage in the field, but if you are more confident with it, than that's the one you should go with. I personally would rather have my choke a little open than too tight. Depending on whether the birds are holding real tight or not will determine what choke you want. The nice thing about the extended choke is that you can swap them out in the field without a wrench. Maybe get an Improved Cylinder and Improved Mod.
As far as the pintails go, are you hunting over decoys or pass shooting? Over decoys, the ducks may be closer in terms of range. I think the mid range tube is a good idea. If I ever get a wood duck, I will have to mount it. They are beautiful.