Thank you both for your answers. I saw in a forum elsewhere the linear pots are something like 20K not 100k and that is supposed to provide better stability but also requires higher power draw. I ordered something from Amazon tonight. I will get back to you and let you know how it goes.
Just out of curiosity, do you both have the stand-alone serial throttle, or is it integrated into a console? (The throttle quad I ordered is stand alone.)