The Wonders don't necessarily have to "spread" culture. Besides, that would shift the balance too much in favour of Hellenistic culture. Not that I would mind but it would not be fair to other players.
Figures shouldn't be hard to calculate, go by multiplying 5% (e.g.: Hellenistic ruler in the region +5% Hellenistic conversion, shrine of Artemis +5%, Large temple +15% and so on).
Also, the type of goverment should affect the cultuer factor. For example: Makedonian Satrapy: Total conversion (+10-15% Hellenistic conversion), Makedonian Allied State minimum conversion (5% or none at all.)
And a settlement would be "converted" when the balance shifts towards the new culture, So if you have 45% Hellenistic and 55% Roman with a +10% Hellenistic conversion, the settlement would "turn Greek" in the next season.
That's my two Mnai.
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