With the update to Poison/2 not too long ago, I thought I would test it out in Brenner and to my surprise the potency is GREATLY effected by enfeebling skill:
Poison 1 testing with the skill level at which the new tier goes into effect:
Spoiler: show
From this data we see that Poison 1 goes up one potency every 5 skill levels (at least for enfeebling skill 400-500) and caps at 500 skill. Formula:
Potency = (Skill-225)/5
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Poison 2 testing with the skill level at which the new tier goes into effect:
Spoiler: show
From this data we see that Poison 2 goes up one potency every 3-4 skill levels for enfeebling skill 400-500 and every 4-5 skill levels for 500-??. There is no known cap other than equipment limitations. Formulas:
Potency = 82 - Floor[(129/430)(500-Skill)] for skill from 400-500
and
Potency = 82 + Floor[(180/783)(Skill-500)] for skill from 500-??
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Also did some Bio3 testing. Byrth had done some before, but there were a couple holes in the data to which I was able to fill in:
Potency Dark Skill
14 319
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15 346
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16 373
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17 400
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17 472
from this data we see that Bio3 potency goes up every 27 skill and caps at 17HP/tic.
Formula: Potency = Floor(Skill + 59)/27