Oooops, sorry folks I was dead wrong with this earlier remark. Thruth is that "net valve lift" has a minimum at "perpendicular" angles not a maximum as I wrote - apparently with my brain disconnected.......!! I now sat down at the drawing board and found out that "net lift" increases rather dramatically when the angle increases from "square". Now, this explains why Saito has chosen to have the inlet valve PR pointing forwards rather than the exhaust PR which points slightly backwards. I hereby humbly apologise to Saito for insinuating they had "suboptimized" the engine.......!!..and this indicates that they also consider - as expected - that inlet valve lift is more important to engine performance.
So what I should do is to shorten the PR as much as the increased sideways movement will allow. And my measurements with pushing down the valves at TDC(fire) and TDC(overlap) shows that there is still plenty of clearance to the piston crown even for this engine.
SrT (and others) do we agree on this "net lift" topic...?!?
And then about "valve acceleration" I think we can conclude that this also should have a minimum at "square" angle..Right..!?
SrT: thank you so much for forcing me/us to dig deeper in this area....