Orwo MA-8

I 've got recently a few meters of Orwo MA-8 microfilm. This is actually what I got
I have the instruction sheet (in German unfortunately) and there are some development time mentioned there, for some unknown (to me) eastern block developers and among them for RO-9 which as far as I know is the original Rodinal so this could a starting point.
My question is that if following the instructions (RO-9 1+20 for 6mins 20c) I will end up with a high contrast negative or I should use dilute rodinal (lets say 1+150 for 7-8 mins) like I have done earlier with Technical Pan with excellent results Dead Link Removed.

IF this is Microfilm, the contrast will be VERY HIGH. Microfilm tends to have small consistent size grains, which is great for keeping a lot of data in a small area, but makes for high contrast. (for the original application this is great as they often are photographing weak carbon copies.)

LOok are the data for the SPUR or the Bluefire developer.