maybe a stupid question for n guage, but have you tried adding weight to your models? i don't suppose there's much room to do this in the bodies, but it has helped enormously with my 00 stock. One advantage of the larger scale is you can always add liquid lead to your wagons & locos.
I also removed the plastic catch rails from a couple of troublesome points (older, small radius Peco ones in the storage sidings).
Hope you resolve this, I know how much work goes in to building layouts, seems a shame to have to scrap it.
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