The colder it is , the longer the plant needs to finish, optimal temperatures are 22-27 degree, if you are under or above it, the development slows down. I wont force the colouring in the leaves, the buds normally get blue/ red in late flower. So far you did well and your plants look very good ( ist not the easiest strain. Keep that track. Gonna follow up if they show up the colours. In my outdoors in late september all my plants showed purple/ blue.. leaves, i called them cosmic leaves with very nice look. but that happend very late. And i i could choose i either liked to have more sun for development.
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