I have two frames from Tsunami. I basically did what deinonychi did - I wanted to have the seatpost clamp centered on the rails. Since I have short quads I normally shove my saddle all the way forward. I figured out that with a zero setback post I needed about a 76 deg seat tube angle. Joseph/Tsunami suggested going a half degree shallower to 75.5. It worked out well although the rails are not perfectly centered, I still have to move the saddle forward a bit.

For rake/HT angle, 43mm and 73 deg give you an excellent combination of stability and responsiveness. There's a reason so many bikes have those numbers. I spec'ed those for my frames too, after having been on a frame with that front end.

Finally I also spec'ed my top tube to fit with a 120 mm stem. Good weight over the front wheel, stable at speed. This meant going to a 56.5 cm top tube. (My seat tube is compact style so 40 cm, the same as a size S Giant, and my last frame before these was a 52 cm Cannondale.)