You are in a tricky area. Rule of thumb would be that if you feel the Original Bar is giving you all the control you need. Then you may want to stick with it. On the other hand, I know you're wondering if you're missing out on better handling. I wish I could give you a definite up or down answer.
It's easy to advise light or heavy riders. There are many factors which come into play within this middle ground you are in. You have side bags, and, more importantly, a top bag. While not typically as important as a passenger, these storage areas can contribute a fair amount to centrifugal force, depending on how they are loaded (weight wise). For best handling, you want to put heavier items in the front trunk. Lighter items in the side bags, and the lightest items in the top bag. You want the weight low and forward. But this is not always possible or practical.
Not sure which figure you gave. But if you weigh 215 on the scale. You could easily weigh 225 with all your gear on.
You mentioned a propensity for aggressive riding and that you enjoy twisties. Perception and expectation are additional subjective factors that come into play.
So, my definite conclusive answer in your case is... MAYBE! With a PROBABLY factor thrown in. Because I believe you will see some measure of improvement with your factors. Whether that improvement is enough to warrant the upgrade, that is a question that only you can answer.
Depending on how high your interest is. And whether you do your own install or not. I propose that I send you an Ultra-Bar kit. You give it a thorough workout and see if it is a worthwhile upgrade. If you like it, you purchase it. If not, send it back and we'll call it even. (I'll cover the return shipping)
I'm as interested as you are in how this would turn out. Just let me know if this sounds workable to you.