mkerzie I also own a 2008 LXI minus the tower and power wedge, but do have the manual wedge.. Most times I ski I have the boat really striped down wedge off, back seat out and all the bow cushions out.. wake is really nice but as stated above from another post when we only have one person in the boat you can feel a difference but nothing to throw you off or freak you out, but we also ski with everything in the boat at times and never have a big bump problem!
I have a buddy that had the same year LXI with tower, pwr wedge and and all the seats and that boat had a much bigger wake then mine, the tower and pwr wedge ad alot more weight in my opinion but still not enough that would get sketchy.. I would look to see if you are getting some water leaks from your skags or anywhere else.
Just my 2 cents worth!