Need help/info. from a boat/motor expert

[Scoot]

I have a 1998 Alumacraft 170 Tournament pro. On the back of it is a 115 hps 4-stroke Yammy which is attached to the boat by a jack-plate. Also on the back is a 9.9 hps 4-stroke Yammy.
The problem is this- the back end of the boat sits too dang low in the water. We took off the kicker motor (the 9.9) and that greatly improved the problem- but... we don't want to get rid of the kicker.
We're wondering about the jack-plate. For our boat we haven't seen the improvement in performance that some boats get with a jack-plate so we have no problem taking it off. However, we'd like to know before hand if we're going to see much of an improvement in how low the boat sits in the water if we remove the jack-plate. It weighs 44 lbs. which is basically half of what the kicker motor weighs- so we'll see roughly half the improvement we saw taking off the kicker motor. Also, by taking off the jack-plate, we'll be moving the weight of the big motor forward approximately 5 inches. How much additional benefit will this give us in terms of how low the motor sits?
Finally, anyone interested in buying a used jack-plate?
Thanks much for the help!
Scoot