What rpm do you guys operate at when using the loader? I was moving some dirt at like 1800 RPM in low and it seemed to want to stall as soon as I went into the dirt. Also when going to pick up the load the loader would not lift it I was really confused as it was not that heavy, I had to back up a little to curl the bucket. Keep in mind the bucket was not full either. I was under the impression it should lift 1400lbs anyway. Any help would be great.