I never used BJ mix, so am not sure how it performs. If you are concerned, use moisture meter or a 'tell' stick. Do you keep your succulents indoors? Also, plants may start shrivelling if thirsty...

According to their website: Contains Bonsai Block®, Monto Clay® and Pine Coir. I don't know about the water retention of their ingredients, but you should be able to find out...used to add turface instead of Monto Clay, but don't use it anymore (or very little & very seldom) because of too much water retention.

And:Re-water Days: Succulents 5-30 days. If true, that is ok...

And:Minimum Aggregate Size: 1/8th
Maximum Aggregate Size: 3/8ths

That seems to be quite large range - I try to be more consistent when making mine...

If the pot does not feel significantly more heavy after watering, there isn't much moisture soaking into the contents.

It might be more productive to ask about specific plants, maybe add some pics. So many plants are called "succulent" but not all have the same water usage, or other variables.