Try repowerandregear ... they are "all about getting brass steam to run well". As to pulling well, there isn't a specific group for that (that I'm aware of). Repowerandregear does talk about pulling power from time to time ... the essential wisdom is to add as much weight as you can fit (may but usually doesn't require changing springs) and, at least as important is to get the fore and aft balance right. - Jim in the PNW
