After 65 years running my many layouts with the old DC rheostat, Ive finally switched to DCC. I bought a cheap NCE system and so far I really like it. But I am having trouble with consisting a pair of N scale Kato F7 units. Each unit runs great and the same speed on their own, but when I try to consist the lead unit runs away and the trailing unit barely moves. I follow the prompts on the screen but with no luck. Any ideas?