Good to hear you solved it, and I'm glad to be of help!
I am going to update this again when I have the time, primarily due to a small mistake I made (but also because I have more ideas for cool stuff to add).
If you scroll through the comments here you'll see the solution to it however. In the current version, it's not really possible to add a bunch of extra friction on the flippers, due to a line of code being misplaced. I have typed the solution in this comment section in one of the replies :)