Catching up on some older posts
Re high nose, I suspect the original Tyrrel reason for the high nose still stands.
That is it let them have more air to the side radiators and thus MUCH smaller radiators and significantly lower drag from said side radiators. Since then all the aero around the high nose is a plus-plus
PS: Designers didn't realise the reason and spent months doing tests on high nose and seeing no effect. THEN they spotted the smaller side pod openings on Postelthwaite's 019 and voila everyone copied Migeot gave a presentation at SMRC 2 years later and told this story and clearly enjoyed the confusion they caused among fellow aerodynamicists