Welcome buddy, hope you enjoy the site.
The lofo's (london Foccers) regularly meet up for ride outs,they are some of the most active members across the lands.im sure they wouldnt mind some extra participants.check out their thread in the meets & greets section.
Ref the tyre pressures, theres a universal 36 front, 42 back that i always stick to, im just over 100kg & never had any problem either bimbling along or towards the edge of the tyres.
The fact that you seem to check your pressures is imo far more important than faffing with a few psi here & there & you havent mentioned taking a heavy pillion or anything.
Try 36/42, do some trial & error with the fork & spring adjustments & find out what makes you feel most confident.
Take it easy
Fras