Spent 2 hours this morning working through the cheat sheet and video in previous post. very happy with the fronts now, suspension is more supple. the rears pressure is still on the high side, so will either be fitting some spacers or perhaps new springs. not sure which yet.
and typed a bit later...
When i started front left was measuring from edge of arch to centre of wheel 20 inches. right front was 19 1/2 inches
Now both 19 1/2 inches.
The front left bolt to adjust the torsion bar was stuck solid. Took a 24 inch bar with a scaffold pole extension, a jack lightly under the socket to stop it falling off, the front wheel jacked up off the ground and a good bit of sweating and puffing to get it free. I had soaked it last night with acetone and ATF mix. I can now move it with a socket and ratchet with weight on the wheels. , the front wheel off the ground,
Initial pressures front 7.4, and rear 8.2 MPa
Final pressures front 6.5, rear 7.9 MPa.
I have looked at rear springs and they look pretty new with no corrosion so I'll either fit some spring spacers for now or look at some stronger springs. Having the 2 fuel tanks and the rear wheel hanging out over the back and my tools in the back will be the culprits, I reckon. I have also upped the airbags to 10psi to give some support.
The front ride height sensors were initially reading 7mm difference. Now they are sat at 0.6mm apart.
The gradations on the tank from Hi to low are 13 indicating the nitrogen spheres are in good shape.