Now you have a hot one Rooster. Since you now have the Ultra would you possibly know what the rear wheel deflection is. I want to get one of the Topeak beam racks but the straight one looks like it could be hit by the tire when the suspension moves, and I will have to mount the rack as low as it can go on the seatpost since I am not too tall and need the seat in a lower position. Topeak has an "A' model beam rack that looks like it could work but I am worried that that one may sit too high with the MTX DXP bag on it. It is kind of hard to determine the fit when I don't have the bike yet, but I am trying to purchase certain things before it arrives so I will be good to go.
You mentioned you want to replace the grips. I put the Ergon grips on my Addmotor and they are nice and comfortable with the palm rest. I got the Ergon GP 1 while waiting for the new bike. I got them from Amazon for only $19.00 a pair. The price varies by the week, or day, so watch them if you like that style.
Have fun riding the new bike.