Test strips NEVER work right, except as sort of "Is there some, or is there none?" guess-strips.

Order a K2006 -- link below, make sure Amazon 'seller' is Amato Ind; some others have shipped K2005's; K2006C costs 35% more, but has 3x as many tests.

Other than that, your readings look good. Just maintain that, and you should be fine. Do remember to monitor your CYA, and adjust your chlorine levels up as your CYA goes up. (See Best Guess page in my signature for "how-to").