Physics would not be different upon each attempt. Unity physics is done on a fixed timestep, if it is different, that would be a physics bugs for unity. (I didn't have the time to switch to havok either so I didn't bother). I was actally planning on doing everything u suggest, but I spent to much time figuring out line renderers, if I ever do this again, I'll likely be able to do much more. Thanks for the feedback :)