Switch Problems and Track Type Changes

[TheHighwayStar]

I'm in sort of a dilemma here re: my track.

My layout, a small one (3x6 ft.) uses Tomix sectional track with roadbed, except for, thus far, two Atlas Snap-Switches (I don't have any of the Tomix brand switches, but I do have a fair amount of Snap-Track.)
Have done all the usual stuff to try to isolate the main reason why my locos keep stalling and occasionally derailing on these. Rails are clean as a whistle all around. Electrical connections–rail joiners AND power–are all spot-on. Swapped out one with a brand-new SS, same problem. Both locos have no problems running on the rest of the line.
Right now I'm operating the switches manually; I haven't wired the machines yet. I did notice that the points themselves aren't particularly responsive, if that's the right word, when the points are changed.

Should I move on to a different brand of switch, Bachmann's perhaps?

[tannenba]

Atlas switches have plastic frogs.  Short wheelbase and most steam locos stutter or stall on them.