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Sometimes a new pad will be contacting a rusty area on the rotor and take a bit to wear that in.
With it shaking also, here is what I would do. Pop the wheels, calipers, and rotors back off. Sometimes rust and crud falls behind the rotor to hub mating surface. Scrape and clean real good the hub surface, and the rotor surface where it sits flat to the hub. Often there is witness marks or little circles where you can tell to put the rotor back on oriented the the hub in the same way it was originally.
Once you get the rotor back on, caliper... tq the wheels real careful in a star pattern. Then go do about 5 firm stops from a decent speed - 50 ish. Don't overheat the brakes, just moderately firm stops. If there is still an issue, may need the rotors turned.
But if it didn't shake before the pads, I would think the rotors are Ok, and something got a little mucked up in the reinstall. Pretty common for rust to fall back behind the rotor to hub surface and cause a little brake shake. That rotor to hub surface has to be perfectly clean.
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