@squitirogloria
I am sorry that you are having problems with cronometer. If myfitnesspal works better for you and can measure everything which you need then I would continue with it.
I admit that with my recipes, I just guess the closest amounts etc and input them.

We usually take strontium the last thing at night just to keep it away from all calcium. Some users do take it in the morning and then load up on their calcium the rest of the day. Usually 2 to 3 hours is enough to allow the body to absorb the strontium, and there is some discussion if even that is needed since someone thinks they may have discovered a receptor just for strontium.

So yes, just try to not take calcium for a few hours in case the body ignores the strontium and just absorbs the calcium.