Which version of the Micro Technical is it? You might want to look at the ground glass and see if it has a Fresnel lens (if you look at it through a loupe you should see concentric circles spreading from the middle and outwards). If it has got a fresnel then I'm afraid that's as bright as it'll be (unless you get a 'faster' lens), but if it doesn't you might want to install one, as this will help spreading the light on the ground glass (be careful though, if you install it 'behind' the ground glass it'll upset the focus).

I've been on the lookout for an MPP myself, how much did it cost you?