CeeGee...I had one of those OS engines. I think they are pretty good. I did find that they can get scared. Doing 3D makes them nervous. The only thing I could do to get them to outgrow it is to richen them up a bit. This is especially true if it's a fairly new engine. Just open it a click or two. Keep doing that until it stops quitting (???) After it breaks in it will be able to be leaned down.
Thanks
Barry