First things first: Bitweasil many thanks for your tools! They show quite impressive coding skills for freeware.
I have however one problem. I managed to run ./GRTCrack -s SRYMYHASH -h MD5 ../../rainbow/GRT-MD5-len7-fullcharset-perfect/*.grt by using the 35gb rainbow tables. I suppose it "only" checked length 7. What do I have to do to check a greater length? Is there some kind of howto or guide in the interwebz? I honestly did not found one

best regards