Hello everyone.  I'm new to the forum here, but by no means am I new to Bachmann products or model railroading.  So I purchased a Bachmann SD70ACe EMD locomotive with dcc and sound a few months back, and I have to say, I'm not impressed at the moment.  This locomotive derails at EVERY possible location.  I have OLD photo 2000 E8/9 locomotives that will run all day with no problem.  I really like this locomotive, and I want to make it run, but I'm not sure what I need to do.  I have an NMRA standards gauge, and checked the road wheels and they are all the same width, so no problem there.  I'm using all Atlas flex track, and all joints have been soldered and filed.  So the majority of my locomotives run very smoothly around the whole layout.  This locomotive just does not want to run.  If I keep it at a VERY LOW throttle, it will make it most of the way.  IS there anything I can do with this unit to make it run smoother? 

Please let me know.  Thanks.
Pat