Yeah your math is way off.
We already knew/know the starting point of 61 and 65 and their applicable ranges and private keys.
61 is in the 61 bit range.
A 1 followed by 15 zeros thru a 1 followed by 15 f’s
65 is in the 65 bit range.
A 1 followed by 16 zeros thru a 1 followed by 16 f’s.
For 66:
The starting range is a 2 followed by 16 zeros
The ending range is a 3 followed by 16 f’s
20000000000000000-3ffffffffffffffff
ive also seen alot of your work sir you sir are a largened indeed. im going based off things ive done myself as long with the math and ideas throught the thousands of posts ive read through multiple threads.