As to your issues, look at you're own past post about objects sinking "Methods for reducing collision problems?" and spinning "unknown spinning". Like I said, you ain't said nothing new, not even to yourself!

My first impression of you post was that you were showing off your current physics project and you were simply listing the issues that came with it. Near as I can tell, these aren't questions. Questions usually end with a ? or require a reply, thing neither of you points asked. You're points weren't phrased in the form of a question, you asked nothing specific about these points, and merely ask us to " please let me know of any problems or suggestions. Thanks. "

Sounded to me like someone showing off his work rather than a person with specific question.

I wasn't aware that your post was merely summarizing the ideas of two of your previous posts.

Sorry for the misunderstand, but be more specific in the future. Just some advice, nothing more, nothing less.

Peace out.