I do not know of any other DH divers who dive DH extensively who use a bent doubles tech plate successfully. I did try for over a year and by lengthening my shoulder straps to the point of being ridiculous and then having the lower edge of my plate (I am 5-11 and shrinking fast) digging into my hip bones and axx and by removing the wing and using my excellent SeaTec horse collar I was still not able to get decent breathing performance. Been there and done all of this.
One thing about any wing with a DH, the wing tends to lift the assembly away from the diver unless well anchored. I find having the crotch strap and by pulling the waist strap snug I can keep the plate against my back well enough not to gap (with any sort of plate with a wing).
As to X-Deep, they look like a quality pieces of equipment that were not very well thought out or were intentionally made different. The center outlet of the wing is just, well, dumb. And the double crotch strap, no thanks. The quality is excellent, the design is poor.
But, I do wish you good luck and if you can be happy with several additional inches of water column above the set cracking effort point. I set my Kraken and Phoenix and RAM regs down around .6 to 1.0. Any less than that and they become jumpy or bypass or free flow due to cracking effort being less than the resistance of the exhaust valve/duckbill.
Which holes? I use the holes that give me best fore/aft trim. If you are going to drop the plate way down by lengthening your shoulder straps to try and center the DH can between your shoulder blades and dropping your tank down until the can runs into the center channel then you will likely need to shift the wing aft/rearward on the plate to try and compensate for being aft (leg) heavy. You may also need to split some of your weight to the top cam band, putting your trim pouches as high/forward as possible. Been there and done this. You may need a chest strap to keep the harness from falling off your shoulders.
Another thing I did and it sort of worked is what I called the Nemrod Mod (done either to the plate or the STA). What happens with standard plates with typical upper cam band position, the shoulder of the tank is lower than the upper cam band. I cut new slots for the cam band lower in the plate or STA to allow me to drop the tank all the way down then only limited by the can running into the center channel.