Reckon 24h would be fine and he's just being over cautious?
Are you heavier than me? I'd happily ride track with 24H on the back with any rim that's sold in 24H. The Flo30 isn't so far off the Mavic Ellipse rim in terms of weight and depth, and Ellipses worked for me with only 20 spokes. Track rear wheels need fewer spokes than road wheels to achieve a given axial stiffness due to the lack of dish.
That depends on how heavy you are...I'm 73kg. I've got a friend who's been beating a set of Ellipses on the road for years and reckons they're bombproof. Also the American classic track wheel set is 24h rear and uses a lighter rim.
Are you heavier than me? I'd happily ride track with 24H on the back with any rim that's sold in 24H. The Flo30 isn't so far off the Mavic Ellipse rim in terms of weight and depth, and Ellipses worked for me with only 20 spokes. Track rear wheels need fewer spokes than road wheels to achieve a given axial stiffness due to the lack of dish.