Just wanted to close out this thread by saying that I tried the Gavin DPV out for the first time last night. My friend and I went over to Madison Park on Lake Washington where there is a square course laid out on the bottom with lines for such endeavors. The scooter worked really well. My weighting was a little off -- it needed 4 lbs to be neutral at depth instead of 5 and it was clocking about 60° with torque instead of 90, but all in all it worked well. I think I can adjust the position of the weight a bit to get it dialed in for freshwater and then I will start seeing what I have to add for salt water.
It was my first time ever using a DPV and it went better than I hoped. My buoyancy was a little sketchy going up and down slope the first couple times, but I quickly figured out when and how much to vent and add gas. I was able to move between the "temporary stow" position and the "ready to go" position easily, but I still need to work on how to do the "permanent stow." According to my battery charger, I was somewhere between 25 and 50% of charge left after about 40 minutes of trigger time which helps for future dive planning.
It was my first time ever using a DPV and it went better than I hoped. My buoyancy was a little sketchy going up and down slope the first couple times, but I quickly figured out when and how much to vent and add gas. I was able to move between the "temporary stow" position and the "ready to go" position easily, but I still need to work on how to do the "permanent stow." According to my battery charger, I was somewhere between 25 and 50% of charge left after about 40 minutes of trigger time which helps for future dive planning.