I might just be trying the wrong tools for the job. But im trying to get a wave modifier to propagate it's waves vertically without having to model at a 90 degree angle.(i like the assigned rotation as is)
I can get the desired motion by parenting it to an empty and moving that around. However not along the desired axis.
Desired motion after applying a 90 degree X rotation and rotating back. (having -90 degrees transformed.)