Here are some FACTS based on 15 years of experience dealing with jet boat handling shortcomings.
There was a time when people purchased a true jet boat not knowing just how bad they were to operate, people like myself who had no idea because we just did not know the lack of control when in heavy boat traffic at idle or that the boat would go back in the direction it was going if you decelerated during a turn, or if you decelerated rapidly and tried to turn at the same time it would just refuse to respond.
This is all well documented on post after post on many jet boat web pages.
My story was similar, I purchased a really nice jet boat for my wife, I already had a fishing boat so this was for her and the kids to use when I went off fishing. I thought I was getting a really good deal , little did I know.
I surprised her with this boat and the first day we took it out my heart sunk, I was so disappointed with the way it handled that I would not even let her drive it. I could not believe anyone would make a boat that was so hard to control, so unresponsive in certain situations.
I actually put it back on the trailer and thought I would sell it immediately regardless of the price, I hated it! I went from look at the nice boat I just surprised my wife with to oh damn did I just screw up I hate this thing!
After a few days of thinking about the lack of positive handling I decided to either solve the steering issue or ruin the boat trying but I really needed to try.
A little side note, I always had boats and usually did a lot of mods even converting a stern drive to a sea drive outboard. I also volunteered my time in a boat repair shop just to learn the mechanics of outboard engines, funny because while there I invented a resurfacing machine to resurface engine heads quickly. It was too hot in Fla. to be standing in front of a heavy glass surface with sand paper on it hand surfacing these heads.
I immediately went to work to invent my first tie rod / rudder steering system. After I installed it on the boat.
We all went out to give this steering a try, in a word the transformation was " unbelievable".
I drove the boat under the Tierra Verde bridge in a strong current at slow speed and noticed that the boat handled wonderfully, it responded instantly to the helm I was impressed the second I turned the wheel and the boat responded.
Prior to testing I had no idea if this was going to have the desired results, The fins were only 5 inches long and 2 inches deep with a large taper providing about 8 sq. inches of surface area each , there were only two. I noticed at high speed the boat was so maneuverable that it could do a 180 turn at W O T instantly with no slide out. Those fins made me smile and made my jet boat handle better than I could have ever imagined. The wife would take the boat and only return when it needed refueling, the kids would tube and water ski.
I loved how it handled so much that I decided to patent it, US PATENT 6561858 & US PATENT 6702630 During the patent process I was instructed by my patent lawyer to start thinking about the end user and how to make steering that would be simple for the customer to install without breeching the hull etc. So that is how the design of the fins being directly mounted on the nozzles came about and continue to evolve.
So from 2001 to date focusing on jet steering and holding 3 US patents , after hearing time and time again that if the steering doesn't solve the steering issues the boat is going up for sale regardless of the loss they take getting rid of it.
Having experienced that same frustration I can tell you this advice, it's the same advice I have given people for well over a decade, try the boat as it was made, if you don't like the handling or lack thereof you have some very affordable time tested and patented remedies available for you to install on your boat that are guaranteed to make you smile when you drive the boat so that you don't need to be worried about the steering not one little bit.