as a yamaha 23 foot jet boat owner going on 8 years i have never used any of the add-on fins ...just practice..take her out when the water is calm to "get the feel" of the boat by yourself to gain the confidence you will need when you are out on the water near other boats and docks ...try to use the "bump the throttle method" when you need to steer as you need to have thrust to steer.
I highly recommend that you join a forum called "yamahajetboaters.com"
the site and the people on it are a wealth of information, everyone helps one another with questions and this issue you brought up on this forum is one of the major topcis discussed there.
in your post you did not mention what model or year your boat is?
TOM
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