Lots of great comments, all appreciated. Yes, my question related to my current setup. Clearly, I need to change my current setup if I want to use my tractor's capability more fully, and you have all made it clear that it means rear ballast, one way or another. And I definitely plan to act on the good advice I've received. I really appreciate it, and I feel much better about what happened, how to prevent it from happening again, and also how I handled it at the time, which was to drop the grapple and just stop what I was doing.
I used to run an offshore fishing boat, and when I first started boating, many situations seemed frightening and dangerous. With experience, handling these same situations became second nature. In that context, I appreciate the points made that spending time on the tractor is a good way to become more in tune with it and also to become a safer operator.