the Dice is simply a FireWire driver, required to use the H8000FW with a computer via FireWire. This enables correct audio communication and doesn't provide any programming capabilities or sound design. This is ossible using the Graphical Editor Vsigfile, which is meant to be used to create algorithms. Probably you simply need to spend generous time on the distortion presets to tweak them.
The latency in loading presets can't be changed…BUT…:
-you have 2 processors in the H8000. So you can load 2 presets and use MIDI to re_route your signal to any of them.
-take a look at the MIDI Virtual Racks (and their explanation in the Presets Manual last pages). These monsters may solve your problem.