hello aadil,
As i said we have already discussed the pros and cons of increasing the sequence length and you are right the results get better by increasing the sequence length because the probability for each bit reduces by increasing the sequence length. And as far as values are concerned, it was just hit and trail thing we had presumed but there must be some relation.
I would suggest you to refer to this link. it has already been discussed in detail. I hope it helps.
Regards