Well you’re correct about saddle angle..
Fettle ride this morning confirms. Next ride will be with a 10mm..

Bike has always been ‘lively’ with a tendency to ‘buck’ over bumps.. and always accepted that this is how it rode. (previous saddle on for 20ys.)

Last night on an aesthetic whim swapped the lightweight saddle for the weightier Brooks with no expectations. The bike is more forgiving, absorbs bumps and rebound is controlled.

I’m putting it down to the heavier saddle.

Maybe Raleigh built their frames with a Brooks saddle on mind..

Hallelujah.