at lower limits players will not notice if you bang in a c-bet evry flop then raise big preflop and check a rag flop in preperation for a check raise with an overpair. They dont see the anomaly there. Better players do. So as above, let them bluff at it! I often do it if i find a big hand in BB and i get 2 or three loose callers in LP who i know play marginal stuff and i hit the flop.
There is also the fact that despite the play at lower limits improving markedly i would say since i started playing poker, they still do not in most instances respect a check raise, it just looks like a bluff.
So yes, check raising is possibly THE most effective play at lower limits.