We have the 2750 and love it. We run in the mid 700's for HP (blown HP500) and run in the low 80's on a warm day, mid 80's on a cool doay and slightly choppy water with the tabs up. At those speeds with the tabs up we get a little porpoising which can be anoying. The 29 is really the same boat and bottom just a bigger version. It of course is heavier than the 2750 so with the same power it will run slower. To hit the 90's in either boat your going to need to be in the high 800's to low 900's in HP. For years Lavey's F1 boat was a 29 but as soon as they finished the 2750 they began to run it instead. That should say something!
Both great boats, if your going to be running in the ocean I would go with the 29 but for rivers and lakes the 2750 works great.
The people at Lavey are great but they always seem to think their boats will run faster than they do. We were told the 2750 would run 80's no problem with an HP500 but not the case. More like the mid 70's.
Hope that helps.
By the way ours is for sale
2750 For Sale (http://www2.***boat.com/forums/showthread.php?t=85816)