Randy,
I have single HP119's that are 7.25dia. If you think you need to try longer tanks, I have the stuff to double them up. I just don't have the desire to dive them as doubles. I like my HP100's doubled better. Just let me know.
One thing that helps with doubles is to balance them in a pool. Start off with the doubles and a wing only. Inflate the wing with enough air to just "barely" float the tanks. Then find the optimum location of the wing to balance the tanks (not head heavy or tail heavy). Then add the plate and do the same. Once that is balanced, then add yourself and adjust the harness to make you balanced in the rig. Once balanced, then see if the tanks are in a good location for you to reach the valves. If not, then you may need different (longer,shorter). This takes a little bit of time to get right, but is a good systematic approach to fixing the problem.
I have single HP119's that are 7.25dia. If you think you need to try longer tanks, I have the stuff to double them up. I just don't have the desire to dive them as doubles. I like my HP100's doubled better. Just let me know.
One thing that helps with doubles is to balance them in a pool. Start off with the doubles and a wing only. Inflate the wing with enough air to just "barely" float the tanks. Then find the optimum location of the wing to balance the tanks (not head heavy or tail heavy). Then add the plate and do the same. Once that is balanced, then add yourself and adjust the harness to make you balanced in the rig. Once balanced, then see if the tanks are in a good location for you to reach the valves. If not, then you may need different (longer,shorter). This takes a little bit of time to get right, but is a good systematic approach to fixing the problem.