Just to ease some of the confusion, keep in mind the Rule of One, and what happens in the absence of required Bash Tags.
Did you take a look at what changes OCOv2 might have introduced into the Khajiit racial settings, especially the "default" head shape attributes for the race? They're talking of Nuska having changed them a lot, so I guess that's what was done. You now loading a different plugin but also changing the Khajiit race in any way, chances are extremely high it will revert Nuska's shape changes back to Vanilla Oblivion's in fact, and even if its own function is simply to change head texture paths.
The shape changes weren't done to the head "mesh" but to the settings for the race's base shape, where all alterations done in CharGen just add to or remove from. And with this we're back at plugin conflicts 101.
Just looked at the base OCO v2 Khajiit head mesh, and compared it to the ones included in Seamless Khats and they are as close to identical as I can tell with my Mark I eyeballs ... without a doubt not even remotely close to the head shape shown in the Seamless Khats screenshot.
All I can suggest is to copy/paste the OCO v2 Khajiit head meshes from it's extracted download and overwrite those found in your game's Data\Meshes\Characters\khajiit folder (actually being the type I am I would delete the ones that would be overwritten first, but then again if there's a hard way to do anything I will find it).
OK ... something I caught before I hit post ... this time no edit tango ...
Even though Blockhead opens up the possibility of different male and female head meshes that possibility isn't explored in OCO v2 for Khajiits or Argonians (it is for the other races ... Nuska had no love for the critter folk I guess). Now Seamless Khats and Args (as well as Seamless OCOv2) does include separate head meshes for male and female (though once again I can't see one lick of difference between them in NifSkope). Maybe the way to go would be to try using Seamless OCOv2 as the source for the copy/paste/overwrite exercise.
I use some of the Seamless series stuff in my game but I'm a cherry picker and so I only have the bits I wanted (and for some time now I've had a personalized "install folder" that includes a lot of different Strikerized stuff like my Seamless picks and "NoMaaM for Striker" etc, so I don't have any recollection of what I picked and what I didn't).
Bottom line ... the head shape you have in your screenshot starts out as a file named headkhajiit.nif in your game's Data\Meshes\Characters\khajiit folder (and you'll need to be looking for headkhajiit_F.nif and headkhajiit_M.nif as well ... Blockhead will use those if it finds them). Replace those files with alternatives until you arrive somewhere you like.
Heya Drake and Striker,
So the problem came back once I continued installing the rest of my character mods..
I'm very new to Wyre Bash so I don't know what you mean by Bash Tags, Drake. I understand now what you mean by the chargen changing the head shape, I think.
Anyway I can force Wyre Bash to use the shape from OCOv2? I'm going to try what Striker suggested with deleting the other Khajiit files.