OK
Problem's solved. Much thanks to 1ponders.
It turns out I was in fact capturing at 10fps and 1/10th of a second after all.
Apparantly, for some bizarre reason I'll never understand, even though the WcCtrl utility reads 10fps and 1/25th of a second, those two settings actually achieve a real exposure of 1/10th of a sec. Go figure
You just need to refer to the exposure table at K3's website.
Weird. Really weird.