Whirlpool Cooktop Temperature Control Problem

The right rear element on this cooktop will heat up but it seems that the temperature is difficult to control as it will either be on mostly a high heat setting, no matter if the switch is set to the medium or low ranges. Thanks for any help.

Replaced infinite switch with P/N 3149400 bought from Amazon.com as it was the lowest price I could find, online or otherwise - $16 plus $4.99 s/h. Just had to shorten the knob as per the included instructions. Cooktop now works as well as it ever did but it still won’t cook my meals for me…