I have a few suggestions, some of which I hope will be helpful…
Firstly, at the risk of stating (asking?) the obvious, what did EFI/Fiery support technicians reply when you asked them? I’m guessing/hoping they are the best place to go for this type of info as they made the product. If you haven’t asked them, why not? They also have their own EFI specific forums too, but no idea how useful it is.
What version of XF are you using? Is it Colorproof XF v4.5 or v5.0? I am currently using Colorproof XF v4.5 with my 3880 & so far have been getting reasonably good results when profiling in RGB mode, selecting Photography in the profiling options, not Proof. I have no idea what version you’re using or how old it is but v4.5 definitely isn’t limited to ECI2002 testchart as there is also EFI’s own chart as well as IT8.7/3 & IT8.7/4 charts.
Regarding your process - what do you mean when you state “HT driver for my Z3200ps that controls CMYK+RGB”? Does HT imply Halftone/CMYK printing? If so, why aren’t you profiling in RGB mode, since you want the best photographic output, not necessarily the most accurate colour, as in proofing?
With the linearization you are performing, I can’t see that it can be of any use, or even used at all when trying to create your actual profile with any other program than Lintool/ColorManager, EFI & Colorproof’s own profiling app. You can’t actually use the linearization you create with XF until you have also created a (in their terminology) media profile (ICC profile) using Lintool/Color Manager. I’ve no idea how you are printing out the "TIF that EFI recognizes as CMYK+RGB. CM turend OFF… " but it will not be using or referencing the EFI linearization file you created earlier. This only happens when printing from the Lintool/Color Manager app in XF.
This also leads on to your problem with patching the profile to the linearization file - actually the other way around, lin patches to profile but it doesn’t matter. Either way, I’m guessing that more than likely this is happening because you haven’t used Lintool/Color Manager to create the profile. And why aren’t you using Lintool/Color Manager to create your profile in the first place? What is your reasoning behind trying to do half the job in XF & the other half in ProfileMaker?
Finally, I’ve never created an n-channel profile but I can’t see why it should be any different from creating an RGB or a CMYK profile - just printing charts, selecting options & reading patches. Shouldn’t be any more difficult than any other profile.
I would definitely suggest you try the entire process from start to finish with just 1 app, be it XF or ProfileMaker/ColorPort. Really, I think EFI support would be your best place to ask but not until you have tried creating your profile using XF & Lintool/Color Manager. Also, try doing it in RGB mode rather than CMYK+RGB/n-channel/CMYK+n.