I do not have any steam with the 3/2 capability, however, I did have incessant issues with two geeps. The frustration with resulted in a 3/2 switchectomy! They run fine now.
Personally I believe by trying to make these engines all things to all people, they are becoming more tempermental. I concur that the simple RailKing offerings are much more robust. There was an initial problem with contacts in the trucks and a small brass piece was offered if pickup of power was insuffiecient. It wasn't, however, well publicized. FWIW