I've got to say that for us, the schumacher rally blocks (still in yellow compound) works much better than the mini pins. The rubber is the same, but the pins are much stronger and that gives a much easier to drive car, still providing a lot of grip.
Also, be aware of the fact that these tyres needs to be broken in to give their true potential. Usually the rally blocks needs about 2 meetings to start providing enough grip. The grip increases with the wear and they are the best when bulled. We don't tend to use them bulled though as we also have some carpet, and bulled tyres are seriously crap on carpet.