Don,
Out of curiosity and boredom (one hazard of winter in the midwest), I've got a TV Paracorr 1 (PVL-2008) coming to compare to the GSO coma corrector. I added 2.5mm spacers to the Morphie's long ago, except for the 17.5mm, and a parfocal ring to the APM 30mm UFF.
Morpheus and APM parfocal rings.jpg
I'm a little confused as to your statement of needing more barrel length for the APM to make it parfocal with the Morphie's, mine comes to focus fine and holds well in the clamp at this distance. 
Anyway, If I'm understanding your other info about the in-travel requirement of the 17.5mm EP, sounds like I should just get the AstroSysystems EP clamp (my current ES clamp is 10mm tall). Since all the other EP's have the 2.5mm spacer, I should just be able to use the Astrosystems clamp with all the Morphie's, correct? I'm attaching a photo of the Astrosystems page with the two 2"x1.25" adapters, but the adapter on the left side looks like the recessed adapter one would need for the Morpheus?
AstroSystems Adapters.jpg
I just saw you have a PVL-2008 Paracorr.
That's fine, but the correct position for the Morpheus eyepieces will all be below the in-most setting of the Tunable Top with the 9.5mm tall flat-top adapter that comes with the Paracorr.
The Paracorr 2 adjusts to -10.16mm (below the focal plane of the Paracorr), whereas the Paracorr 1 only goes to -6.35mm.
The Astrosystems adapter gains you 9.5-6.35=3.15mm, so the effective height would be -9.5mm in the in-most position.
For the 4.5-14mm Morpheus, you need a position of 0 (3rd position on the tunable top in the PVL-2008) MINUS the height of the adapter, whichever adapter is used.
That would put the 4.5-14mm Morpheus eyepieces exactly at the in-most setting of the tunable top with the Astrosystems flat-top adapter, with no rings on the eyepieces.
Great.
But, the 17.5mm Morpheus needs to move in 2.5mm farther than that, which is impossible with the Astrosystems adapter. You need an even lower-height adapter (6.35-2.5 = 3.85mm).
The adapters with even less height than the Astrosystems adapter are just a bit too tall (the Tele Vue In-Travel adapter, for example, over 4mm tall with the Morpheus eyepieces).
You've already made the Morpheus parfocal with each other, which means they all need the infocus of the 17.5mm, so I recommend the lowest height adapter compatible with all the Morpheus: the Baader Push-Fix adapter.
It's 1mm tall for most 1.25" eyepieces and about 1.5-2mm tall with the Morpheus, which sit on the outer lip of the adapter.
The Push-Fix adapter would actually require some OUT travel of the tunable top, which would put the optimum positions for the eyepieces within the range of the tunable top.
So, how would you figure out where the 12.5mm Morpheus, for example, should sit in the Paracorr's adjustment?
Easy. Put the 12.5mm in the Push-Fix adapter and measure how far above the Paracorr's top the shoulder of the eyepiece sits. Add the 2.5mm spacer to that measurement.
Let's say it is 4.5mm, hypothetically. That means the proper setting of the Paracorr's tunable top would be setting 3 (the 0 point) minus 4.5mm.
The tunable top has 5 settings, each one separated from the adjacent settings by 1/8", or 3.175mm (rounded off, 3.2mm).
So the 4.5mm in travel of the tunable top would be about 1/2 of the distance from setting 4 (the next-to-lowest setting) to setting 5 (the lowest setting).
Since you've parfocalized all your eyepieces, they should all use that setting.
Let me know if anything I just described isn't clear.