Alrighty - figured it might be of interest to some if I updated with what I actually ran in Nannup… Maybe.
I ended up on Schwalbe G-One RS 50mm front and rear (file tread through the middle, with side knobs of sorts). 26psi front, 27psi rear (I’m about 80kg loaded). In the end, I figured if I was on the main line, I was probably good on these tyres, and if I was off it (which I was a few times!) then extra knobs through the centre wouldn’t have made a lot of difference.
Luck was on my side as it ended up raining a little in the days leading up which likely meant the surface was a bit grippier than normal, so better for this tyre than if it was super dry.
The RS was awesome for any time maintaining speed was necessary, rolled really well over some of the shorter, punchy climbs, and on the couple of road sections, they spun up really well and carried good speed.
I broke traction a few times more than I’d have liked while climbing out of the saddle, but I reckon I would have on any tyre.
While descending, they were pretty manageable. I had a couple of small hairy moments where everything almost turned to custard while off line in the softer pea gravel along the side of the road, but thankfully kept it upright. Again, I’m not certain a tyre with more tread would have helped in these situations, rather me reading the road better!
All said and done, the Seven course was awesome, it was great to race somewhere new, and after hearing all the chat about the climbing I was pretty nervous with what lay in front of me - ended up it wasn’t as bad as I thought, and although there were some tough climbs, most were short and not too steep (although there were steep sections) - there was just a heck of a lot of them, my Wahoo registered 32 actual climbs 
Now I know what I’m in for, I’m looking forward to being back in October (hopefully!), think I’ll go back to 45mm tyres for weight alone as the kush of a 50mm I don’t think is needed on that course, and I’ll be leaving most of my spares at home - this time I was prepared for all eventualities, tube, chain breaker, chain link, 2x tyre plug tools and spare plugs, battery pump and 2x Co2’s…. I’d figured in order to qualify, first I had to get to the finish!
Ideally I’d have no hydration pack and rely solely on bottles, but with no feed support this time, that wasn’t an option, so pack it was. Fingers crossed we (the Kiwis) can line something up for Worlds to keep the weight down!
bring on october!