I have to agree with John. A self-adjusting pressure roller above the powerfeed would take a bit of invention but might solve your problem with minimal investment if accuracy rather than high production is your main goal. John's clever setup is shown in post #5 here
https://sawmillcreek.org/showthread....hich-Is-Better. Perhaps you could stack an arm and roller on top of your existing powerfeed using its integral pivot and spring. It would be simple to make a few cuts with an improvised tall fence and fixed featherboard to see if that approach would give the accuracy you are looking for.