Alright - seem sI have gone some of teh way to sorting out these dramas.
Along with the fuel filter and new fuel hose I have realised something stupid on my behalf.
The enrichment circuit ie useless choke, was not retracting fully. I thought I had checked it several times, but where the old hose around the wire had cracked a little, it was getting snagged easily if bumped.
So, 150kms into this tank, before a ride, I adjusted it. I did 50km in traffic and putning through the twisties. Good fun, hadn't done it on a R65LS, but definitley appreciated the twin brembos.
Anyway, I was on the express way at 110kmh, 5000rpm, when the previous mark of 200km hit. Kept going (should have seen me tucked behing the bikini fairing on my tank bag for streamlining hahah).
I got 255km before reserve, so considering the first 150km may have ben all with the choke on somewhat, we may be back in teh rigth range. Fingers crossed.
It was never spluttering or appearing to run rich so I never checked it that closely - idiot.