CAN YOU NOT POST IN ALL CAPS? IT HURTS OUR EARS.
There, that's better.
Don't know why you'd think a higher-voltage rated capacitor ill reduce the output voltage; it won't. The output from a bridge rectifier is actually 1.414 (2√2) times higher than the AC input (minus two diode drops).
So far as whether 3 V overvoltage will damage your actuator, well, I'm not going to advise you that it won't. I wouldn't do it.
If you're concerned about the motor, get a 12 V voltage regulator that can handle the load current.