Regarding the scan script; if I use any subtract other than one, it always gets a false positive.
I've used subtract values from 16 up to in the thousands and always get a wrong result (false positive).
If you use a large subtraction number, the result shows up way out of the upper limit range.
Can you shed any wisdom as to why?
have you possible to generate DB more than 2**28?
I have generated a DB with 2**32 Keys in it.