I remember watching a video on youtube about the auditory illusion thing they do with rythms, where it sounds like it's constantly speeding up/slowing down, despite staying the same tempo. It the rythmic equivalent of a Shepard Tone. Unfortunately I can't find the video now, but I'll link it if I do.
Otherwise Pam's should have ratcheting and bouncing ball envelopes, no? You can also (self)patch lfos or envelopes to its CV inputs and have that control clock rates or divisions of certain channels. If you have a looping envelope with EoC/EoR out in your rack, you can control the rate of that and get all kinds of wonky swings and bursts. There's probably still plenty you can do to fuck with the timing and groove even with your setup, you just have to think outside the box. Like if you have an oscillator that goes into lfo/subaudio, use the square out as a clock/trigger source, then sequence that.