Sebastian,
Do you care to elaborate ? If you need assistance we can talk via private mail as well ...
I use the script intentionally with scamper restricted to 200 pps - not sure why (and what) I should elaborate ;)
The needed time (even for the default of scamper with 1000 pps) is imho a rather good explanation to torland's question why only 68 of nearly 300 participating IPs finished the whole measurement at least once.
Renke