ISC,
You will need to bench test the operation of the valve. If you have another one plug it in and power up and watch to see if the pintle runs properly. The B&G code you are using only has a graph for setting position over temp, crude to say the least.
Come over to the dark side with the extra code where you can really get things setup, or confuse the hill out of yourself trying. At least they have real time control. But first make sure the valve runs in and out.

Better yet,If you do have another valve that was last in a warm engine, swap it in. Do not power it as it may be at a good idle position. This is how I had been running my 4G63 before.

Oil therm.
If I recall the oil Tstat seats at the base of the threads inside the housing. I have not had a leak there so I have not learned allot about them. I have had many apart since I port all of the oil systems I work on.