i would flush,if you can as stated get some clearex or similiar.if you flush with water flush with a mild nute solution on your last gallon of water.as you want to flush with a 2 times the volume of water for the volume of growing medium.i would also addd some epsom salt on the last gallon.what size bucket is the plant in?a flush is always good to do any way in your grow.
i am also thinking that the ph was in the 4,s a bunch of nutrients are blocked at 5.8 and under phosphorus is one of them,so when you where feeding the plant it was un able to uptake the nutes.
that is why your leaves where dying.then you added the dolomite lime which brought the ph into the 6's and now the plant is now able to uptake nutes but you have such a build up in your soil that the plant was not able to use becouse of the ph that it is killing your plant