i wouldn't learn atemi from aikido. that would be an exercise in frustration. try learning it from a good wingchun or JKD school. and i would encourage you to explore Systema striking approach. i found Systema striking approach fits well with aikido. their strikes flow with the moves, with no wind up, with extreme relaxation, and it has the tendency to penetrate deep inside the body of your target. the Systema folks also teach you how to take strikes too, with relaxation, not tensing up. it hurts more when you tensing up.
btw, if you hit folks in aikido, most of them will get all pouty and accusing you of being a brute. the fix for that is hitting them again, and again until the pouting stop.