Some people use a 5pt stop. So a 4pt dip can easily take someone out depending on where they entered.No.
Market had already broken to the downside and was in a downtrend.
The opening low offered support, and was accepted.
Many of you could solve an analysis problem if you just add a 0.1% fudge factor to your Hz lines. In this case it looks like ±4 handles worked fine. Particularly if you use the bar close.
You're welcome to show your trades if you're doing much better than the ideas I suggest.