I have noticed my foil/mast is not fixed firmly in the mast plate despite the screws are tight and thought this was normal. However, I decided to search the web and see anyone else complained. I found the following information on a kite site and I will try to fix based on their guidance. I felt that despite it is said that wobbling is not a problem, I am feeling differently and wonder if anyone else had this issue with Slingshot mast base for track based boards?

Like the picture shws, carefully run a layer of aluminum tape around the top of the mast and carefully insert to avoid bunching. This type of shim has stopped the wobbling for me.