Maybe. But you'd have to get IP data from Scubapro that I've never seen. Here's the thing: absolute IP has to rise completely evenly with depth to maintain the relative IP that drives your second stage, or in the the case of an eCCR, your solenoid. It can't be "overbalanced" - a design flaw of environmental sealing that Aqualung and others falsely claim as an advantage.I apologize for resurrecting the thread. Rob would not MK17 be a good alternative to XStream on an RB?
Since the CCR is designed to operate at great depth, any overbalancing will have larger and larger effects on the ability of the tiny battery powered solenoid to open against IP. That is why the oxygen first stage on my CCR is set down around 105 psi, rather than the usual 135, to make it easier for the solenoid to operate without consuming the battery.
The Mk17 is sealed, unlike the Poseidon. I don't know what happens to relative IP at depth. A Mk11 might be a better alternative, if you want Scubapro. The Poseidon doesn't need sealing, because the rolling kevlar impregnated diaphragm sheds ice so well, and the wide open top rinses easily after a dive.
But as you may have gathered above, what really attracts me to the XStream is the HP seat design.