My bad, you say per cubic foot. I'm spaced out. Sounds like your ph readings are accurate, good tools and methods.
Either way, seems like a ton of lime to me. I am not to knowledgeable on the other stuff (or anything), but if you can add more soil mix without any lime, I think it would help a lot. Imo ideally 1/4 current - nearly 0 lime. I've seen a lot of people suggesting to use so much lime, I just don't think it's good.
Could be the rock dust, I never add much since expensive and I assume it's only for micros, so not much is needed and never tested it's effect on ph. I also use glacier rock dust which may be different. Just did a quick look into your rock dust and it says it need 5.5 ph or lower to be effective.
My current soil mix has lime (it's premix plus what I mixed in, so I have no idea how much lime and I added a cup-half cup to 40 gallons), but I think I wont be using it anymore (sprinkle only for micros nutes), just because to much affect on ph and I don't know how long it last but I believe maybe just 1 grow, give or take. I want as stable as possible ph, just off soil mix base ingredients (anything ~10% or more of mix). Any additives after that, just for ~feeding soil, hopefully very little effect on ph.
The lime is the only thing that stands out to me but I am not even 'novice' gardener. Imo, lime is best used for micros, so not much needs to be used.
I use gypsum too, same as lime, just sprinkle, 1cup -1/2 per 40 gallons. Again, just because I think it adds some micros.
I guess you may already be thinking this but if not, make sure ph is perfect before planting anything.
Note: I have only brought 1 plant to harvest using what I say above, but all seems well and more plants getting close to harvest with it. All cannabis grows before were hydro.
Lastly, what you could do in with the plants in high ph soil MAYBE, is to use something to lower the ph of the water you water the plants with. It could help, maybe not. From my experience soil is very diffulcult to change the ph of with this method, so it's a last resort, if it even is a resort.