yes exactly Y or -Y
Well I don't have the computing power to make 2**66 tries.
I have nothing to lose, I can only try
2**66 was just a quick estimation around which repeats start to show up, as you said you pick random 2**133 numbers.
You'd still need to make ~ 2**102
unique random selections (or simply, sequential BSGS steps) until you find the key.
And the it might not even take 2^30 unique Randoms, we don't know.
The problem I want the solution for is the data base creation , hunting p135 is not practical for me I might try for 1 night after making the data base see if I get lucky.