well to be honest there i would flush your plants real good it appears there starting to burn give it like 4 days then resume feeding schedule at half strength that you had going and not trying to be to harsh but at 6 weeks sorry to say they are a little behind prob slow growth due to stress of over fert once its corrected she should really take back off
but if you can address it ASAP
and to give some of you a idea heres 7th week pic sativa / indica strain