You actually have your hole in the wrong place. If you are using 4" pipe, your hole should be 3" from the bottom. You want a 1" air gap to self prune the roots so the plant doesn't get root rot. You want about 30% around the pipe to allow wicking.
I re measured. The holes are at 3”. I will redo the soil next year and mix in the ProMix. See if that helps with the wicking.
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