At your weight I'd go with 28/28 spokes laced to some Ambrosio Crono F20. They're old school box section rims so aren't exactly aero but they're around 375g each and make for a very comfy ride.
I'm not aware of anything new out there, Alu tub rims are disappearing (Velocity used to produce 2, now both discontinued) so I suspect the problem is that Tubs are a small market and 99% of tubs are deep carbon race wheels so there probably isn't a sustainable market there.
Alternatives I know of are -
Hed Belgium (expensive, not all that light but can do lower spoke counts)
Mavic Open Pro Tubular (i.e. Escape). 400g, high spoke count but wider than the Ambrosio. Personally I don't think they're really what you're looking for.
Kinlin TB25. I believe they're around 435g, V profile and stiff and strong. You could probably build them up 20/24 spokes and make a more aero wheel but I don't know if they meet your light requirement.
My Tub wheels are -
Ambrosio Crono 28/28 to DA hubs (1,380g)
Velocity Escape (now discontinued) 24/28 to Chris King (1,350g)
and I'm building some tougher wheels for winter using Mavic Open Pro CD (tub) 32/32 to Ultegra hubs as an experiment to see if the CD coating lasts. Should be strong and comfy but they're going to be around 1,650g.
Just what I was looking for! Thank you for the detailed list!