So I have a new Kato WP F3A loco that Ive been running along with my other new engines. My powerpack is an MRC1370. I've noticed that this engine doesn't want to run until Im at 40% on the throttle and then its rolling a t a decent clip. My other engines will start moving smoothly at 20% throttle but they are 6 axle units compared to the 4 on the F3A. I remember seeing a thread about a similar issue with another member's engines but I cant find it for the life of me so Im asking again. Apologies. Im not sure its an axle count issue at this point bc I received the WP F3B unit and it starts smoothly creeping around 25% like the other 6 axle engines. Anyways what are my options at this point? Live with this engine and just run it alone? or should I consider buying another, hoping it creeps like the others at 20-25% throttle so I can run smoother more matched AB configurations? Will it degrade the B unit or vice versa if I run them together for a long time despite their difference in throttle response?