Gary ... perhaps we have another definition of "tough" ...

Yeah. We do.
15 minutes footage of absolutely shit riders constantly falling off on pretty standard natural Alpine terrain. They're the main reason I couldn't think of anything worse than queuing up from 4am to "race" the Mega.
I'm still of the opinion, Why do you want FS?
I wouldn't have thought Antwerp would have the knarliest of mountain bike terrain
The definition of "clydesdale" rider is 220lb+, You're a clydesdale and a half so still way past the norm.
As for wheels, it depends
how you ride just as much as your weight. I'm 200-210lb and Don't have a single set of wheels I wouldn't feel confident sending a 15ft drop or 50ft jump with. But I'm a smooth experienced expert level rider (skills wise). All would last just fine for a 330lb beginner rider just riding around and not jumping etc.
I have 11 bikes and quite a few spare wheels so somewhere around 20 sets in total.
All my wheels are fairly standard 32 spoke 3 cross patern, on decent sealed bearing hubs built onto good 21-30mm (internal) rims in the 550g region. Even my DH wheels are sub 2000g.
I am a very experienced bike mechanic/wheelbuilder but many of my wheelests are pre-built off the shelf wheels (as even with everything at trade prices, pre-built wheels are cheaper) but obviously I have the advantage of being able to tension a pre-built wheel myself to my own preference.
At your weight, I'd consider going to 36 spoke hubs/rims for added stiffness, and I'd consider FR rims of around 600g for the same reason. 36 spoke wheels are far less common pre-built and far less common at bargain prices, so if going this route you're going to have to go to a wheelbuilder/shop to have something built. If you went for something off the shelf you still have the option of taking the brand new wheels to a good wheel builder for a tension/true. (about £20-30 per wheel). whatever you buy, pay particular attention to the spokes used. you want a reputable brand and do not want to be going for anything with overly light butted spokes
Whatever wheels you have you are going to have to run properly supportive tyre pressures or you'll end up denting the rims.
Do YT stil spec E13 wheels on the Decoy?
If so, I'd remove them before even riding the bike. infact I have a set of unused E13 wheels here taken off my 2017 Capra (I meant to put up for sale and never got round to it).
E13 wheels have been nothing but problems on all the YT riders bikes I service. There are numerous reasons for this I won't bother going into here but trust me, get rid of them if you do go YT