Congrats on finding another viable head that fits, yeah it is fantastic how well a porting and decking job works on these Hawks. Despite just getting a Multistrada 1200S, it is so rewarding to take the little Hawk for a spin after all I've done to it.
How much was the TT250 head from CSC? Several people have said it flows better out of the box than a bone stock Hawk head does...ARH