Sourdough starter

Hello- My sourdough starter (KA unbleached white bread flour and water 100% hydration) is now about 3 weeks old.  It rises very well after every feeding, at least double sometimes more, but my bubbles are not real big, there are a lot of them but they are fairly small. Is that ok?  I keep the starter on the counter at room temp which fluctuates between 65-71 F

I have not baked with it yet, but plan too soon.