dremel away as you like. There is plenty material to make it just perfect. Having said that, I do not think there will be much, if any difference in power. The pressure drop when the port opens just is so large, that the gas will be presed through it, and the port channel shape hardly influences the cylinder discharge. That is why tuners do not turn much attention to the channel shape, but more like to heed the port shape which influences gas discharge big-time.