Welcome to the forum, I'm not really into vape tricks but did catch your vid and it is definitely worth the time to watch it, well put together, great job.
Here is how I would calculate it. The original amount of concentrate is 24ml, that's 8 equal parts of 3ml. Now take the new amount of 31ml and divide by 8 = 3.875ml.
eta: Here's the math (31/24) x 3
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