Re: Questions on Yoshokai Aikido
Kushida Sensei is an excellent teacher. In the upper kyu ranks you will likely encounter specific sets of movement designed to develop fluidity based on the solid basics practiced over the previous several years.
I can not speak for the atmosphere of the specific dojo you are looking into, though, but hopefully it works out for you.
High falls should be taught well in that organization and, if done correctly, create little impact on the body. Ukemi, in general, is focused on quite a bit.
If I was traveling through that area and saw a Yoshokai dojo nearby I would go well out of my way to train there.
Hope it works out for you!