welcome to cdc great place to hang out,,,,with that water depth around your dock i would think they would start showing up ,but as long as they can find a easy meal in the big shad balls it may take some cold weather to get them there,,,1 other thing how long has the pvc been soaking,by that i mean has it been there long enough to get the algae coating it takes to attract the smaller things that then draw in the crappies,, fuzzy