When importing, rotate it and don't leave the cutoff point at bottom. When you do, it just adds on crap to the base height that you can't remove. It compresses it. Slide the cutoff slider until it just leaves a nice looking bark section. It will preserve the detail.
I really wish there wasn't a 10mb limit on attachments. This was just under 12mb crv file with the stl in it when zipped.