A 2' bar on the socket tightens them fine. It's about 100ftlbs
You will need about a 4' bar to undo them with though as they do tend to tighten with the miles.
The splines are the same. Always use Copper grease on the splines.
My car run at 20psi is more comfortable than my previous Plus8 with 15" rims at 24psi, I would say the extra diameter would help you out on the 3rd world surfaces that we all seem to share these days. I live in the sticks and half of my Morgan drives are down country farm lanes with the grass growing along the centre line of the single track metalled road and some are pretty rough, so everything gets a light brushing underneath but the ground clearance is good.
Good Luck.
