Go to a parking lot for the duration of the hours 11:00pm till 4:30am six nights a week and do nothing but track stands and skids.

Try and make it an empty parking lot.

Shouldn't be any more difficult to trackstand on certain ratios than others. At least, it hasn't been in my experience. Skidding's another question, but like I said, practice. I run 82.1 gear inches, and can skid/trackstand just fine.