well folks, thanks for the advice and suggestions. having tried a few boards (but far from a comprehensive selection) i have gone with a 2009 nobile shinn twin, 132x40.
after three sessions on it, from marginal freeriding in 15 knots on my 10m to 30 knots fully lit on butter and in small waves on my 8m, i can share harry potter's previously expressed enthusiasm:






low end and upwind are awesome.
the super wide stance suits my lanky 6'3" frame.
the footpads that others have found hard i actually like, and the straps, whilst firm, fit my narrowish feet well and keep the board on my feet very well during jumps and blasting top speed through chop without needing to be tight.
the flat rocker took a little getting used to after the curve of my tempo but is no trouble at all. weight a bit further back when carving onto waves and it's all good. no spray problems and i'm not using the rocker-shims. not sure what the fuss was about there.
popping is ridiculously easy. for my weight this board has enough flex to dampen landings and enough stiffness to let me load up as much as my skill level permits.
carving, both heel and toe-sides is insane. today i pushed as hard as i could and it just responded.
this board does demand more of me than my tempo, and i would not have been ready for it even three months ago, but, with my meagre though improving intermediate skills, the shinn rewards me very well when i get things right. that's what i was after: an all-rounder that was more challenging and more rewarding when ridden at a higher intensity.
(and i got it at the right price!)