Maximized (+3 level) and empowered (+2 level) on a 1st level spell makes it occupy a 6th level slot, not a 5th. On the plus side its not 7-9 str penalty, as that would imply their str is lowered by 7-9, when its actually lowered by 15-19. You are correct that their str modifier is lowered by 7-9 tho. Bestow Curse lowers their attribute by 6, not their modifier.
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