When my 2016 GTX300 hits 69 I can feel it back down (I will buy a SCOM this year). If you're only getting 62 MPH it sounds like to me your ski is not getting to the point where the SCOM will help.
They're (suposedly) limited to under 70mph so unless you hit that wall to start with, nothing gained. I'd be seeing why you're so slow! I have a 215hp RXP and hit the wall quickly by myself and still can hit it with my wife on the back.. We're over 300lbs combined. A 260 with 175 on it should peg the 70 mark in seconds