Going on a suggestion to try and better match the tune to the wastegates I undertook an effort to log actual boost for a series of fixed wategate settings.

These logs are shown below:

The charts above shows boost pressure recorded in third gear.  For populating the data table I used data collected in third and sixth gears primarily.  After recording several other gears as well I determined that those two gears sufficiently covered the pressure curve I was interested in.