Full boost is about 3.2k rpm, starting at 2.5k rpm. You can see where it hits full boost on the dyno graph and the torque really jumps.
I don't think I've every tried to go from < 1K rpm in WOT. I'm not sure why I every would either. :)
You're calculations are way off, but I won't be any help with the compressor map.
'04 Mach 1. Built. Turbo. 667whp/631wtq
'06 Focus. Built. Turbo. WMI. (sold)
'03 Mach 1 : 12.61 @ 106.59 (sold)