i am using the 2006 Stype 115, the fastest board if ever used in this class!!
Typically i power it up with RS Slalom 6.2 or 7.2 , In choppy conditions this combination is in my view and from experiences matching with a friend on a IS101 is advantageous.
I agree that S-type riding is very physical and requires a higer skill level particular in over power conditions But it is worth it - I am 95 kg so this helps
No doubt for me , no better overall freeride/freerace board available on the market !