Are you getting the bud formation you'd like to see? At 6 weeks flower they're just about done. I'd say transplant to bigger pots and go easy on the ferts from now on, but they've been in flower to long I'm not sure it would be worth it. What you can do is learn from this and take it easy next time. There are different ways to fert plants which takes all the guess work out and just lets nature do it's thing. You mix some powder fert in your soil and just give water as they grow. You won't have any more nutrition problems in the future. You live in Oman?