Is mixology nerfed for spirit flask?

Mixology is the alchemist profession bonus.  All other professions have bonusses aligned with gems, elt's consider the healer situation:
blacksmiths get 2 extra sockets = 320 int or 640 spirit
enchanters get ring enchants for 320 int (ouch, if you like spirit)
leatherworkers get to replace the wrist chant of 180 int by a chant for 500 int, so +320
etc., etc. etc.

Enters the alchemist with mixology: your int flask is worth 1320 int instead of 1000. so +320 int, OK.
But should you flask for spirit: 1480: +480 instead of +640 for a BS?????? WTF??????

Do I get things wrong or is the balance off?

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