So I finally got an answer from the ALA seller. The capsules contain 100% of the old R-form. That means 300mg per capsule. I will stay at this dose and take it on an empty stomach. From my research, the old r-form should be half as effective as the new form. Anyway, I have no access to the new form and ordering from the US is too expensive. So I'm happy with my current product.

Thanks mrsD for all your help, I hope my regimen will work, as we discussed