Throw away the drill sheet!!! Go to a shop ask the driller if he can do anything different. Short pins on symmetric balls don't mean that you have to settle for a pin down. Granted, I'm not discrediting what SV is saying because he's right. Most times, short pin= pin down. You can go pin up if the driller buries the fingers to ensure statics. Just nothing dynamic.
The Yeti is a very dynamic ball all its own. There are just more variables, like grips or no grips, span, etc. But see your driller they can help a lot more.