Jim:
Welcome to the TDR Website!
The "STS" plate you mention is really "TST Products. "
The company is owned by Mark Chapple a retired
Cummins Engineer who "pioneered" the fuel curve
torque plate. I have used several of his cam plates
and can tell you they work very, very well.
I have not used any of Ted Jannetty's products but
he is also very knowledgable on the Cummins
engines and does alot of testing. I'm sure his
cam plates would work well for you too, but as
I said, I already had the plates from TST.
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John_P