yeah, good advice, i dont have a kit to look at, but i looked at some pictures for ideas. this is supposed to be a street bike, so I kept things conservative. I could have gone a few mm deeper, and even a mm or so wider on each side, but i didn't want to risk snagging a ring, and due to the re-shaping of the transfers, i dont plan on using the boost for a primary flow path, just for a slight improvement in scavenging.
while you do get more port area out of a squared-off port, the flow through the port doesn't improve significantly because flow through a 'corner' is severely restricted by the two sides being in close proximity, and you cant go as wide without snagging a ring. the domed exhaust port maintains better torque than the same sized squared off port, because the exhaust gasses that start flowing out of the center of the bore can leave while maintaining more pressure to keep the edges of the cylinder burning at high rpms. Jennings alludes to this, and so does Bell, but niether of them really get into the chemistry and fluidic implications that show the real potential for modifying ports like this. I can assure you, a port shaped like this with the same time-area as a square port will produce a much more useable powerband, and higher max power. I could go to a much more agressive time-area target with this and still maintain more torque with more power, but like i said, this is a daily driver for my girlfriend.
I also dont have any intentions of running a variator on this bike, in which case i would have been comfortable sacrificing a bit more bottom end.