I currently have a Powerdrive V2 with Ipilot on my Nitro Z6. It is only 55lbs and I need something bigger. Iam looking at upgrading to the Terrova w/Ipilot but have a concern. With the PD, if I use Spot Lock, I end up going back and forth across the spot where it is locked because of over correction. I don't know if this is because the force of the PD is too small and by the time it cathes up, it goes past the spot. Then it turns around to get to the spot again! Does anyone experience this with the Terrova? Thanks for any help. May just go to the Fortrex or Maxxum.