your best option is to actually change the range from your current range to the following.
991<n<50000000
Also you should change each of the k values to those we are currently using... that would be your best option.
This can easily be done by downloading our dat and participating in our project considering this is where the support is coming from, LOL
Seriously,
that range seems tiny for a project unless they don't plan on testing very deep. In order to answer that question we really need more information.
How deep will you expect to test
how many k will you eliminate before then
are you double checking and when will you start
a quick calculation for your increase in speed is something like (% decrease in range)^0.5