Thanks for the input guys. I believe #40 is enough, even with added weights for different suit configurations. With the backplate, the rig is approximately 22lbs. negative at full fill, so it is kind of heavy to start. Luis, do you encounter and "pinch" or "crush" problems with the DR sandwiched between the tanks and the backplate? I think I'll opt for a wide spaced wing of some type just to get good clearance for inflation. I have an old Zeagle Ranger travel BC that has a pretty substantial wing that I can use for experimentation. We'll see how that does and go from there.
"Where'd ya get that ol' thang, don't cha' know them thare things ill kill ya!"
Live From the Red Sea,