I returned the 750's rear shock to stock again. The bottom 10mm self locking nut feature is worn, needing replacement. though the top one is fine.
The shim's just proved the compression stock is far too harsh, but the spring is fine more or less on settings 1 -4.
Found that a lambswool single seat cover in the cupboard from my long gone T955 Triumph Daytona that with a stretch fits the seat of the 750.
Bit tight against the tank centre area, so I hope the paint will be OK. It makes the ride height feel a fair bit higher.
Test ride tomorrow, and the tyre pressure set to 36 from 42 PSI. I didn't feel any benefit to this when new, but after 1400 km who knows ?