I don't see much point in setting the barrel back with a correspondingly deeper chamber if the ramp and extractor slot remain in place. The loading ramp is the weak point in almost any self loading pistol, this is where the brass has the least support and you haven't moved it. Same argument applies to the extractor cutout to a lesser extent.
If you can move the ramp back with the barrel and still get the pistol to work you might gain something. But what? The new setup is not proofed. The design working pressure is actually much higher than the actual working pressure to begin with so you are sort of gilding the lily.
If you are planning on REALLY hot loads, you are running pressures for which the pistol has not been proofed with either setup.
A note: design working pressure is the intended maximum working pressure for the design. Prooving is intended to uncover flaws in the metal, not the design. If the pistol has been prooved for a lower working pressure there is no gurantee a higher pressure will not uncover a flaw even though you are still inside the design pressure. This is a significant point in the case of the Luger because the design working pressure is for the carbine. The pistol proof loads ran about the same pressure as the carbine working load, hence they were proofed for working pressures well below the design working pressure.
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