I try to stick with the CAR, especially on the marginal decisions, unless I've got a really great position and can overrule with authority.
However some of the flags you get are complete rubbish and its clear, even from not being directly in line that the player was not offside, in which case I'll shout something like 'he's not offside, play on'
I tell the captains before the game to play to my whistle, so if the flag goes up and the defenders all stop, then it's their look out.