You are assuming the issue is calcium deficiency, excessive micronutrients can cause similar symptoms.
The aqua flores is formulated for harder water, it has much higher micro levels than the hydro flores which is formulated for use with soft water (like yours). If you used the hydro flores with hard water you`d also have issues
In a nutshell, the hydro is a better match for your softwater than the aqua. You could buy a litre bottle (AB) of just the hydro flores (softwater) to see how grow #6 does on it