So about this differing outlet shapes...
This is what it looked like before:
Heres what my blower outlet looks like now:
I have less KR with this blower on, same rotors and snout as before though.
No other changes were made.
For the current shape all I did was continue the triangle up a tad bit and down to the bottom. Then a chamfer.
Still matches the curvature of the rotor which seems to be the key to efficiency.