I would like to buid a puzzle switching layout 6'x1' in Ho using Fleischmann stock. But I am having trouble with the Fleischmann uncoupler track and Profi couplings - working is erratic, so am I doing something wrong, and could operation be improved? Is it possible to successfully change Fleischmann couplings with Nem362 sockets for Kadee couplings - has anyone tried this with a degree of success. If it is workable, which Kadee fittings should I use? Help and advice appreciated.