Sometimes the malossi reeds can hit the casting inside the intake port. I use a spacer with the Athena reeds to let them clear and open all the way. The polini reeds barely open, I think on purpose to clear the casting.
I think Ken is right. Too much timing and too rich, at least for now. Bringing the timing down to 1.0 will make it easier to feel out your jetting. Once your jetting is right you can start creeping back up to 18-20 degrees if it doesn't get hot.