I checked the steering effort in 6 sequential tests turning lock-to-lock (quite the workout) while parked:
1) SVT controller disconnected engine off
2) SVT controller disconnected engine running less than 5 seconds
3) SVT controller disconnected engine running more than 5 seconds
4) SVT controller connected engine off
5) SVT controller connected engine running less than 5 seconds
6) SVT controller connected engine running more than 5 seconds
There was no discernable difference. In every test I had to use both hands and throw some of my weight into it for at least the last half turn of the steering wheel. Oh well, at least it was a good workout.
I just realized I probably should have checked/cleared codes after plugging in the SVT, since one of the first 3 tests could have set a code and I can't say for sure that it wouldn't have affected the outcome of tests 4-6.
Might do that and retest 4-6, do a 9V test from the inside connector, and/or run it long enough to measure PS fluid temp changes after I eat.