1/10 for that joke BRoadI've watched videos of that phonebook trick, I cringe at it tbh!
There's already a skim of filler from the rolling that's already happened so I'm a bit reluctant to mess with the current arches, got a spare arch I can tinker with if I need to.
Tried my new fifth last night and I can drive between 70 and 80 on the clocks at roughly 3500rpm, a vast improvement and you don't really notice the RPM drop too much for general driving.