Thoughts on soil?

Hey guys, just shootin' the breeze here, but If you check my post "Dropped in my lap" I've been noticing since they got here that the soil doesn't seem to either drain or (dry?) right? I've had to aerate the soil a bit with my Ph meter cause I have seen it clump up and stay wet for a few days after watering without any signs of drying, unless I aerate. He must have just not had a very good soil mix. Anyway, I'm looking into ways around that, I've always done my own mix, not sure what he's done. But I just don't want the roots to give out to root rot. I see lots of clay pellets, but most were at the top of the pot? I didn't think it was useful, I thought the pellets helped with the drainage and aeration BELOW the soil? I dunno. Hoping you guys had some wisdom, I may just wait and see exactly how long it takes for it to dry completely @ the top of the soil, I just watered a day ago with enough to reach the bottom of those 1 galloners.
 
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