It could simply be a fatigue cocktail from the century; hayfever; interrupted sleep from the earlier sunrises; cycling holiday stress; driving myself bonkers over a set of fancy wheels!
Probably a combination, take a break for a few days/a week to really put things into perspective. Choose you 'want' to ride, rather than feeling you 'need' to. I found this hard myself as commuting most days really doesn't help you 'want' to ride.
Zonda C17 Disc - Probably right to be hesitant. Although I've heard nothing 'bad', I've equally not heard anything 'good'. Thinking how solid and supremely loved the rim version where I'm surprised to not hear more about these.
Fulcrum 5 DB - Probably fine, although you do know
Fulcrum is Campagnolo don't you?

I wouldn't be worried over either brand to be honest. Both well known and regarded when it comes to wheels.
Alex CXD4 - Review well, certainly one to consider if you didn't want to max your budget. 3 colour decal would bug me. Great weight and being tubeless is a surprise for that price.
Prime Pro Disc - Would avoid, have only heard bad things about Prime so far. Just too cheap. There's a reason the
Wiggle ebay page always has sets up for sale.
Hope custom wheel build - Fantastic hub but I'd want different rims on it. DT Rims are not expensive and very well regarded, as are brands like Hplusson and kinlin.
Borg22 - No idea, probably good but do your own research on the components used.
I wouldn't worry about tubeless, certainly not now you have those new GP4ksii. I've done the same this summer but will be revisiting tubeless for winter as I'm getting close to needing new winter tyres.
it's not uncommon for factory wheels to have metal (and therefore weight) put into the rim to support heavier riders with lower spoke counts. They are a one-size-fits-most effort, and may be overbuilt for light riders
True, I always figured this was why 'off the shelf' wheelset weights generally varied so much - as every rim they purchase gets used. A wheelbuilder will generally pick and choose his rims dependant on the application. Heavier rims getting built into the 'everyday' wheelsets with the best ones getting made into the 'summer' wheelsets.
Hunt Aero Light Disc ordered from Hunt, plus a set of Ultegra SM-RT800 Ice Tech FREEZA centrelock rotors from Merlin (using some of my loyalty points to reduce price to ~£75).
Good choice, although the RT800 rotors are awesome it always bugged me how less awesome they look than the black DA ones! But we know I'm picky... Although nothing some paint wouldn't solve!
Yeah that was the climbing one. Cheap shot I know
Haha, well noticed though! Love the banter, keep it up!
EDIT: Have a great weekend all!