As for the woman that had a problem with her V Star 650, they make a whole series of aftermarket seats and stuff to fix this problem. But I would also get on a V Star 650 forum or two for they should know how and what works best for you're not the only one with a problem with this. The bike is basically designed with this problem from the start.
As which is more stabler, 3 or 4 points, I don't know scientifically. However, a large group of people, when they first start riding, put their feet on the ground, flat footed, and stand up a bit. This causes them to lose control of their bikes because their legs just aren't holding onto the bike anymore.
As for the woman who started this post in the first place, take your seat to an upolsterer if you feel uncomfortable doing the work. Most shops will fix that in a jiffy and it should be fairly cheap. But stick first.
It's good spelling but it Wobbles, and the letters get in the wrong places. WtPooh
My First Custom, Late 90's Sportster, Heavily Breathed On, Big Block, S&S HP Heads, Custom High Performance Pipes. Wickedly fast, Uncomfortable, Front end is a jackhammer. Age 18yrs, Still have the bike!