Here are a few things you should know.
By law, stock skis are not allowed to go over 70 MPH. This is some sort of Marine, Coast Guard, Civilian restriction.
So, all the fun we have, is at speeds less than 70.
Now, if you are a part of a competition event, you are free of this restriction.
(and taking your life in your hands too!)
So, what I'd Doo, is contact each manufacturer, and tell them you are participating in a number of competition events. And that you would like a print out, or to discuss this upgrade path with an engineer.
From this research, you should be able to get one that meets your needs, and comes with an upgrade path that does not completely destroy the reliability of the machine. Then, don't run it over 70 mph, except occasionally. You can get ticketed for it. There is a reason for the 70 limit!
I will add, if you hurt somebody else, because of your excesssive speed, that you are liable before your maker. (you may be dead too, and that may be your next stop!) So, this appointment may come sooner than expected!
The whole geometry of boating changes at speeds in excess of 70.
Many of the engineers of these PWC machines, have designed the hull for LESS than 70. There are possibly some hull mods necessary to make them SAFE at 90!
You learn alot of things fast, at 90, and some of these lessons you may not live to tell about.
Be safe!
Nate