Funny thing just happened. I was hauling bucket loads of gravel down my driveway to do some minor work on one spot and noticed the soot level went from 1% at the beginning to 6% close to the end. During that time I was running down in high range, rabbit and back up in high range turtle, trying not to work the tractor too hard yet. Still only has 40 hrs on it and the driveway is quite steep. Average grade between the gravel pile and the work area is about 10% with a few spots that are about 15%. The distance from tgrabel pile to work area is about 3/4 mile. So on the last trip up the driveway I ran in high range, rabbit at 2000rpm and watched the soot level start at 7% then drop to 6% when I got to the top.
It's all a learning experience.