Hi guys thank you very much for the interest.
Firstly, I am happy to mix viscosities in the box, it doesn't all have to be the one oil, it's mostly to use the space in the box for transport cost effectiveness.
Now for your bikes, I would prefer to see higher viscosities used. Particularly in high heat, PM412 SAE15w40 or even PM403 SAE 20w50 (20w50 would clean up notchy gearchanges more) would be more suitable. If you are currently running 10w40, or if you want to run a full synthetic, then PM421LA would do the job. I have a lot of faith in that oil but my belief is it's just not the right one for the job.
I'm happy to supply the synthetic, but just want to make sure I am helping you guys make the best choice.
Brad