You are creating Babystep file from 1G to 10G in babystep file you only put X values (or part of it or I do not know)

You are jumping from 264G ----> inverse point n - 264

And you can jump 20G in one jump and try to match X values of the point...

number of line you hit is for example 3... you have 2 solutions ...

private key = n - nuber of jumps * 20 - 3

private key = n - nuber of jumps * 20 - 3 * 2 - 1(because of infinity point)

I mean this is something I am thinking about not sure