Nice one.Nice timming for christmas.The purple is most likely down to the strain or temp.Is not not very warm in there when the lights go off.I'm more impressed with how frosty it is.You just need to up the wattage of your light and get some more nutrients in at the right time to bulk thosw buds up but its too late now.The plants will use lots more phosphorus and potassium for mid flowering if its there which makes the buds bigger and better which is what the PK Boosters are for.The photoperiod seeds are easier to grow than autos.The best way to up the wattage is with a HID lamp.You can get a package,600w ballast,shade and bulb for around £50.
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