Wilder's ADX/DMI+/DMI- are about the best single indicator set-up invented. But don't accept whatever lookback parameters were defaulted on your platform: experiment and find what is best for your underlying.
(And how do you know when you've got the best set-up? Because you can put up a piece of paper over the candles, and describe what the candles must be according to what the ADX and DMIs show you.)
From the questions/observations you've posted, I'm sure you will see very plain, and very robust entry/exit indications from those three squiggly lines bopping all 'round on your screen. Do NOT be concerned if you don't see your trigger points reflected anywhere else on the web. Look at your own 1minute or 1hour graphs going back, add up the entry/exit $$$ (take 'em to the next candle, just to be fair!), and develop your *own* protocol.
Sorry, in my testing this +\- crap, spent enough time I could have walked cross the states. Not to say others didnt found useful. The ADX is ok I guess.
I am a bit different in half my systems use variety of indicator entry generated but optimized over 3 timespans so it don't go with could be best but the "mean". I don't believe in one indicator for trading entire chart as price action when studied often best for exits. Indicators best used to indicate and stats give me a yes no.
Enjoy the ride