Hi, I've mentioned this in another thread but are you using the Clarity setting at all? Setting it to anything other than '0' results in the 'Storing' issue. Not sure why this is but hopefully it's something that can be fixed in a firmware update.
You can't use the front/rear dial to control aperture on a lens with an aperture ring. However, what you can do is control shutter speed which then will affect your aperture. To do this, set your camera to program mode with aperture, shutter speed, and ISO on Auto.
I have been interested in macro since the Fuji X-line came out. I bought the (in)famous XF60, and although it's crazy sharp for portraits, I've never been satisfied with the close-up it produces. About 1 year ago I sold it.
Over the years I also bought the MCEX-11 , the MCEX-16, and the Raynox 150 and 250. Now I get satisfactory results using my X-H1 and the XF50 and XF90 lenses.
I can confirm : prime lenses are much more suited to be used both with extension tubes and Raynox lens