Hi,
Are you sure the problem is with the sampler?
It could be a sequencer problem. What resolution are you running you sequencer at.
Some people seem to run Cakewalk and other sequencers at the default 120 ticks/beat without ever realising you can't define a 32 note accurately.
I've never heard anyone complaining the Akai is that slow, there are a lot of them about.
Paul