What pads? If they were these:
https://www.summitracing.com/parts/s...FdgKgQodcecAOg
then they are known to leave deposits on rotors. Bed them again and see if it changes the shaking. The shaking may not be gone, but if it changes the shaking, then it's deposits being left on the rotors. I'm not sure how the venting/slotting on the rotor changes this behavior. My *guess* is that since these pads leave deposits when they are run too cold, and the vented/slotted rotor runs cooler than a solid rotor, then it's putting you in the "too cold" temp range more often, so you're more likely to leave deposits on your rotors.
These pads get great reviews, but you need to be pushing them pretty hard for a street car in order for them to not leave deposits on your rotors.