Congratulations on finding those private keys. They are correct. I am impressed. However, ...
Totaly i foud 8 keys in a day and have few hours to the end of day.
And i spent about 30-40 minutes on each new public key to prepare the data
But probably I will find 1 more key maximum.
I have question about the formula O (sqrt (n)), it means that the time spent is equal to (sqrt (n)) for the range from 1 to n
so if for example n=64 than to break this range i need time sqrt (n) = 8s ?