The flushing idea was a great one...I would suggest using a 33% 1-1-1 to start off with (very safe)1-1-1 means 1part of each micro grow and bloom...
I think BS420 gave you good advice, but your plants look pretty good considering what you did, so I would take it light for a week using 1-1-1 formula,then I would go with what is recommended on the bottle 1-1-1... after you change photoperiod to 12/12 use lucas formula for bloom photoperiod...

by 33% take the direction's on the bottle and mix 1/3 of what they say to use in veg photoperiod, I think that would be 5ml per gallon.

I also, would like to know if you have thought of using any additives...I would recommend you get some Liquid Karma and keep it simple this grow; You will be happy if you do...hope this helps, welcome to the forums, both of you...Goodluck.lw