Maybe you could double up on the test and do a quarter tab. I don't know how they work, but if there is something like "take 10 units and mix with one eigth tab", then maybe you could use 20 units and one quarter tab. Like I said, I have no clue how the tests work, just ratios and spit balling...
Agree that it is nearly impossible to get an accurate eigth of a tab, thus the thoughts on doubling up.
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