There are a few guys on here that have made deflectors for SI ducers that made the roster tail go away. If you have too much of one you will need to relocate or adjust the ducer a bit. If it is cutting out on you that means it is either getting out of the water or too much turbulence (air) between the ducer and the water.
I have mine mounted thru hull (glass boat) and everything reads up to 60mph (that as fast as the boat will go) other than the DI. Pics would be helpful (for the experts on here). I am not an expert (especially on metal boats). Good Luck.


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