My '04 Mobius LSV has Perfect Pass Digital Pro. I have some buddies that are pretty hard core skiers, and the PP has a "slalom" mode. When I change to Slalom and set a speed of 30-33MPH the boat never gets above about 28MPH. The speedo seems to read accurate, and PP maintains a perfect speed in wakeboard mode, so I can't figure out what's going on with slalom. Any ideas?

- Mobius Richard