How do you guys handle re-entry after getting stopped out early on a good setup?

Been looking at the $DAX and $EUSTX50 lately, and I've had a few situations where I identify a solid setup, get in, only to get wicked out by what feels like noise, and then the move I anticipated happens anyway. It's frustrating because the analysis was right, but the entry or initial stop placement was maybe a touch too tight. My question is, do you usually wait for another clean setup, or if the original thesis still holds strongly, do you try to re-enter, perhaps with a wider stop or different size? I'm trying to refine my risk management without being stubborn.