Mud Tussles - Now Waterthunder you are describing something I don't know anything about. That sounds interesting.
We have floating grass, in places, large expanses of it. If you are a light weight you can walk or run on it. Sort of like waterbed. We use the stop and rock the boat back and forth to make the mat settle building water up under the hull. Then stomp it.
I would agree with Waterthunder, HP seems to be the key. The hull seems to be second. That Kline will slide across it if I have her maxed out. But when she stops, it can be tough to get moving. Seems to be not as bad as heavier hulls since she doesn't sink in as much. But there is nothing as embrassing as having someone pull up and stop, take your passengers, bring them to safety and come back to help you.
One thing that I have seen work on occasion is running past the stuck boat on either side a few times. Of course you had better have the rudder tied down and a good operator. It will sometimes get enough water on top of the floating mat to get the other boat moving.
I have seen a few boats on top of water hycinth or lilies. A thick mat that was grown together and they jumped up on top. The wide leaves stick to the bottom and it stops sliding. Opps. Now you are moving an island.