Clutch pedal vibration/pulsating

[Petegraintrain]

I got a 2015 peterbilt 389 I swapped a cm570 signature 600 in it beginning of this year. Did a new eston 2050 clutch right away too. And since then or a few weeks after that I have had a vibration in my clutch pedal under load. As soon as its pulling hard I get a bad vibration/pulsating feeling in the clutch pedal. Its more noticeable if I rest my foot on the pedal to get rid of the free play. Can also feel it in the floor. Has anyone ever experienced this and could give some insight? Is it a clutch problem or an engine problem? Thank you.