For #1 - Try putting the OS prop washer on before the adapter nut.

For #2 - What is hitting? Is the spinner touching the end of the adapter nut? Or is the spinner touching the prop blades?
If it's touching the adapter nut, the longer 'ultimate' spinner might work. Or you could file off the end of the adapter nut to get the clearance you need.
If the spinner is touching the prop blades you'll need to file or sand the slots bigger so they don't touch.

The 10-32 socket head screw can be cut shorter or replaced with one that is shorter.