I have that very grinder. It's apparently good for everything. But not espresso.
I think there is a way to mod it to make it finer, I'll ask around as I know some people who tested it at beta.
By the by, what coffee dose are you using? You could go up in dose to increase the resistance.
@Chalfie started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
I have that very grinder. It's apparently good for everything. But not espresso.