Fermcap-S... 1 drop per gallon of starter wort is plenty. Add it when boiling your DME wort, prevents foaming and boil overs there too.
Do leave it on your stirplate, you're growing yeast. Otherwise it will just ferment and grow far less.
It looks really good. You can cold crash it when it's done and pour off most of the starter beer, then pitch the slurry. If you have enough yeast, you can save some for your next starter.