I don’t know what to tell you! If you think they are suffocating because of the soil, then you have to do something! And you can’t put them into holes with the same soil mix in it! I have never used anything but the cheap small per light! Probably around 25 bucks for 4 ft.³! A huge bag! Worked fine for me! Landscape supply! Maybe Home Depot has it! There are still a lot of unanswered questions here! Weather, the soil moisture is causing the problem or something else! Then the holes themselves are gonna be questionable! I think you can kind of answer that by digging out a few of them and see what the soil down below looks like! You’re gonna have to dig them out anyway to add perlite! I don’t like holes! You give up access to the roots! So it can become another big guessing game as to what is going on down there! My ideal solution would be to score some 20 gallon tan grow bags and dig the soil out of the holes and put it in the bags with a bunch of perlite! At least on a few of them! Kind of depends on what the soil in the holes looks like! That’s what you get paid the big bucks for! To make these career, defining decisions!
