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We didn’t know what we did was a cave dive till after we got back and told Edd where we had been.
if that is the case, you should have some words with your cavern instructor for not clearly outlining the limits of your training and how to determine them. This is more a learning opportunity for any other cavern divers out there vs. bashing on you which if you've talked to Edd and told him, you've probably heard enough.
So regardless of what is defined as the "cavern" zone, your certification has a 130ft total distance from the surface limitation because it is a recreational certification, you have no redundancy, not enough lights, etc etc. A great option to ensure that you don't violate that limit is to use a Dive Rite Classic reel with #36 line on it. It holds ~250ft of line which gives you enough for primary/secondary tie off and some zig zagging, and since you are usually tying off at some sort of depth, it will push that limit, but not excessively.
Out of curiosity, how does a 60ft tall vertical shaft not seem like a chimney? or were you thinking a small tube?