U46 MK2 and higher latency settings

Hey guys. I'm using the Mixvibes U46 MK2 card and I am using MIDI control for the decks. I'm curious as to why with the latest drivers I can't get higher than 512 on latency settings. Every other sound card I use can go way up to 2048 and I would like to be able to utilize the higher settings. Am I imagining that this used to be possible going back a couple of years with the other drivers? Any thoughts on this?