Sealed Diaphragms: Ambient Pressure Transmitter Failure at Depth

[Geo7]

The thread mentions this regarding transmitter deformation:

Just my 2C, but if you check back on the posts you got those diagrams from, I believe the cause of the drop in I.P at the highest pressure was that the plastic Hydrostatic Transmitter became deformed under these high pressures. They actually had accompanying photos of the remains of the transmitters. So what would happen to these regs at these extreme depths were that you would get less and less gas out of them.
From what we can see it happened to both regs in your diagrams but at a much later stage for the scubapro. This would lead me to believe that the scubapro Hydrostatic Transmitter is made with a material that has a much greater resistance to crushing/I.P than the Apeks plastic one, hence the delivery of a more stable I.P.