Just figured I would give a quick update and some pics of the fix for my 2020 212s....
The tension screw adjustment didn't quite fix my issue (I should have listened!), so I decided to follow the advice and just fix it the right way. I ended up bending the tension adjustment "fork" to make is so there is now no more "slop" in the part. I figured I would attach a before and after of how it turned out. It did take a little bit of "muscle" to bend them, but nothing extreme. I also had to remove one of the bolts holding the fork to the throttle case, and loosen the other so I could slide the for bracket far enough to fit a pliers on it.
I ended up not removing the throttle assemblies from the boat, I left all the cables attached and just sat in the captains chair and did it all in about 45 minutes. Pretty simple fix.
I did a decent amount of testing, and it made a huge different, the throttles are not rock solid and don't drop RPMs at all over an extended period. I can set them and leave them.
Again, Thanks for all the help in this thread, and for this forum!
I removed the plastic covers by removing the screw in "red". (Still had the small cover attached in the above pic.
I took the snap ring off so I could remove the exposed bracket in the pic below
Once I removed the snap ring, I removed the "arm" attached to the throttle cable (sorry, no pic) so that I could remove the tension adjustment mechanism
This is the amount of "slop" (in red above) that was in my tension adjustment bracket fork (about the same for both throttles) before I made the fix.
I removed the bolt in green (using a 10mm socket) and loosened the other bolt hidden by the throttle arm in this pic.
This allowed me to rotate the fork bracket enough to get a decent pair of pliers on it so I could bend it tight.
Below are the results. No more gap in wither throttle. This corrected my throttle drop problem completely!