So, to answer he's running a very basic Fox 36 Rhythm Float Grip. Which is what came on the bike as stock. He's got a 25' Vivid Ultimate air on the back end.
Thoughts are between a Zeb Ultimate or Lyrik Ultimate, but i'm still slightly torn as to which to go for.
The Zeb Ultimate will be stiffer and more air to move as it's a 38mm chasis. The Lyrik will be slightly lighter of course and maybe more responsive. Looking on Pinkbike on a recent "who's riding what in EWS", a lot more are riding the Zeb over the Lyrik... MAybe the weight aspect isn't such a massive thing?
Regarding Enduro series it's really Southerns for us, or Mini-enduro. None of which are massively difficult for him in terms of tech... Although clearly he needs to ride them faster

but that's not quite the same thing. If he continues with the Enduro stuff then there's a shit-tonne of options of course like Scottish and even then things like Skyline Bolly things but i'm trying to let him decide on things rather than me pushing him into things. It's got to be what he wants to do rather than what i think he should do.
I do also find it a bit weird that people are struggling to fill Enduro events, maybe it's just the current financial climate that's affecting it, maybe it's an Ebike thing, maybe it's a time/distance thing... Not really sure. After all, Enduro to a great extent is what many of us do week in week out, so you'd think it would be more popular. You'd think it'd be the most popular actually.
The fuel he could tune with flip chips or even 1deg headset cups, but in truth, he won't.... he's not that kind of rider.
Once we throw a fork on there, that'll be him, done.... he'll just ride it as it comes.