Hi Paul, I've enjoyed the ownership of 3 Versys 1000's a Mk1 and two Mk2's.
90% plus ridden with my wife on-board, with a top box carrying easily 5kg of stuff and between the three have covered about 60k miles.
Tyre pressures have always been as the recommended 36 front, 42 rear.
Checked on the day as they can vary due to the temperature of that day.
Those pressures have seemed fine, but I have found different makes of tyre have worn very differently.
For example;
Avon 3dXM's have lasted around 6000 miles and in those miles performed very well and wore out 'round', where as a set of PR4's on the front managed less than 4.5k and were shaped like a 50p piece by then and the rear was equally poor.
I have also happily used Bridgestone 023's & T30's that have remained in good shape till the end of their life.
But, like yourself still do ride with a pillion, with a combined suited and booted weight easily 190 kg, and if this is you then you may need to empty the piggy bank and invest in a better quality rear shock with the correctly rated spring. It is a vast improvement.
I tried the Hyperpro and standard shock and found little difference over stock with the Versys carrying such a load.
Regards Vern