great job kiy! <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />

however (sorry about this <img src="/ubbthreads/images/graemlins/puppyeyes.gif" alt="" />), i believe you may be correct only in your assessments of permanent potion attribute raises in difficulty settings other than hardcore.
i played hardcore and can state absolutley that the attribute gain for MADE potions (holy water/alchemy plant) is 10 points, not 8, in version 1.45

here is MADE survival potion, before and after
MADE strength before and after
MADE agility before and after
MADE constitution before and after
all 10 point gains.

the reason i designate 'MADE' in the above is because 'FOUND' in-game potions provided a much different degree of attribute gain.

here is FOUND survival before and after - just one (1) point!
FOUND constitution also raised but a single point.
FOUND intelligence before 1st after first yet before second, and after 2nd . notice by drinking the second intelligence potion (same character) there is NO GAIN! however, handing the second to DK ( before and after ) provides the same 7 point gain as the initial character.

because i played on hardcore, i do not have the ability to go back and check the MADE permanent potions in differing difficulty settings. perhaps someone can do this? i serioulsy believe that the attribute gain is dependant upon your difficulty setting.

but without a doubt, the level of attribute gain in hardcore is 10 points for any made potions.