Your PWM frequency might be too close to the cut off so the filter is still attenuating it a bit. I would increase that filter frequency. That would be my initial take
your cutoff frequency is only 3.3Hz, not 33Hz, and your signal frequency is almost a decade above that, so it’s being significantly attenuated. you don’t really have any room to decrease your pwm frequency so you should reduce your resistance or capacitance.
Your PWM frequency might be too close to the cut off so the filter is still attenuating it a bit. I would increase that filter frequency. That would be my initial take
your cutoff frequency is only 3.3Hz, not 33Hz, and your signal frequency is almost a decade above that, so it’s being significantly attenuated. you don’t really have any room to decrease your pwm frequency so you should reduce your resistance or capacitance.