Hey Jono. My set up is different to yours as I run 285/75r16s and it's a 4.5l petrol auto. I do have a 63% reduction.
At 100kmh I'm only doing about 1800 rpms. Anyway for me the 63s are just what I want and i do a lot of the stuff you mentioned in your OP. I think the autos may get away with a set of 85s for what we do because of the higher ratio than the manuals. It would be very very low but I think you could live with it, but the 85s in a manual box IMHO would be far too low for a general all rounder set up. The 63s on the other hand would be gold. I don't have any vids of my exploits at hand sorry. Just my thoughts.
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