Todd:
If you have front hydraulics, look into a grapple bucket. It makes moving things MUCH easier. You could have moved that brush pile in an hour or so with a grapple bucket depending on how far you had to move it. Can you change buckets easily? JD has a system for quick attaching front implements, so switching between buckets, plow, etc. is a 5 minute deal. I use JD as an example because that's the only one that I have experience on, besides Kubota.
Making the rear wider will help with stability.
I was thinking long and hard about a grapple, Scott! You are spot on that it would have easily taken half the time if not even less, but I ended up doing a lot of hand loading to get logs and tangles of vine and brush into place on the bucket. I don't have an extra set of hydraulic valves on the front, though, so I don't think the tractor is properly equipped for a grapple unless I'm missing the boat on how they work and what extent of hydraulics are needed for them.