@Jim1, @Larathiel and @bbtech, a hat and a kind thankyou to you all for your helpful input and information here.
Thankyou ALL for the clarification. Just on the record here I honestly would not have minded having a level 6 Purge in terms of difficulty. Frankly I would actually prefer it as I love to be challenged in Conan Exiles (actually in games as a whole, which is why I generally gravitate towards survival horror titles). However by the same token I wouldnt want to create circumstances which would prevent human Purges spawning in at this point. As such, I will set it to level 4 until I can land a few additional craftsmen, then once I have gathered what I need I will likely set it to 6 and leave it at that.
Thanks peoples. At this point I am only really interested in more craftsmen, as I have an absolute cornucopia of Fighters and Archers. Seriously it is that bad I actually groan out loud when I run across T4 Fighters and Archers now and just chop them up. Other than that my long running quest to obtain all female T4 Dancers is still ongoing. I have all of the information I require below; 3 of them are just being stubborn with their spawning.
Anyway I seem to have gone off point here. What I intended to say is that I feel I now have enough data in my hands to go and customise the settings and start (trying) to get some of the Purges I am after. Although it may take me a while; I just dont have the luck of Brian from Monty Pythons Life if Brian.