Powders do make a difference, as I have read of many 204 owners that cannot come close to factory speeds when they reload. The do have the ability to "tailor blend" powders for a specific burn rate, and often these powders are not available to reloaders.
There was a notice put out about 5-6 months ago on the leverevolution ammo, stating that the powder is imported and might not be available for some time.
I think they should have put production on hold until then. otherwise people will lose heart and confidence in it.