I tried to find more info about the areation of that particular soil.. I couldn't find much info. All it really says is that it has perlite in it. Doesn't say how much.. By the looks of the soil, it doesnt seem like much is in there. The soil may hold/retain water longer than most others. Have you played around with anything other than watering? If so, what did you play around with and did you notice any difference?