First of all, there should not be a "u" in front of the code. Why did you do that?
Where did you come up with such huge numbers!?
The highest that most people use seems to be 32/64. (but there's nothing really wrong with 10/32) There is no need to clog your RAM with such useless info as 432 remembered cells, since the rewards of "faster loads" is so minimal that you will never notice.
Remember that these Buffers require that you also use Thread Loading.
Test what works best for you, but IMO, such huge numbers are pointless.