Well, I finally got my bike - went with the Venge Pro and upgraded the wheels to Roval CLX64s.
Had a checkout ride on Saturday and then did the Laguna ****et tri on it yesterday and my first impression: wow. It is responsive, holds its speed amazingly well and is very, very stiff/agile - which.makes cornering and fast descents an absolute dream.
And the Rovals make a very satisfying "whoosh whoosh". To say I am satisfied with the decision is an understatement.
Whole bike with the 64mm wheels, bottle cages and pedals clocks in at 7.98kg. Plan to switch to latex tubes and Turbo cottons, which should take some additional weight of and also reduce drag/RR further.