Was there any major hull redesign lately?
Would thrust vectors on an earlier model do the same as articulating keels on 2019+ models?
I strongly suggest you first drive the boat as is.
Once you do you will understand the shortcomings of the steering handling and tracking of the boat. And then you will know what to address.
Articulating keels were first introduced on the 2015 boats with a few exceptions like 19 foot boats were in 2016 and 21 foot in 2017.
Also these boats loose steering and just plow water if you are turning and rapidly decelerate. That alone could be a serious issue when retrieving downed water sport participants.
They also loose speed when making a turn and they have a lot of bow wander on plane.
Also the twin engine rudder setup relies on only the right side of the steering system to operate the rudder.
This has caused the right steering cable to break if the rudder hits the ground from the left side pushing the to the right, snapping the steering linkage next to the nozzle where the adjustment threads are located.
Having the patented second tie rod setup splits the work load increasing longevity and creates redundancy in the steering so if one side ever failed the steering effect would not be compromised as the remaining side would continue to provide the full steering effect the twin tie rod setup also holds the nozzle angle settings so it does not rely on the nozzle cables to do that thus holding the settings.
I started the aftermarket jet boat steering after inventing steering for a jet boat that I purchased and totally hated how it handled .
After adding my steering to it I could not believe the huge difference it made I loved it , soon people started asking me to make them for Yamaha boats , That was 23 years ago going into year 24 now.
I make model specific steering with a large variety of options all at buy direct discount prices all year long and free domestic shipping .
My systems provide the most features and benefits available .
So do your research , As for steering it really does not matter if it has a rudder or not.
My systems solve the steering issues from slow speed to wide open throttle and even during rapid deceleration and you can tack big waves . You get adjustments on most and a choice of base or deluxe systems plus other options like extra slow speed forward and reverse improvements . Some have paining surfaces for faster hole shot and a smoother ride in chop. So just remember my advice , do your research before you buy any steering product .