I like to flush 4-5 days in coco. Haven't found any sense in flushing longer - you lose weight.
When flushing coco I like to add humic and fulvic acids (could be from compost tea or from extracts) to help the taste a bit.
I think you did flush them a bit early and for too long. I would have started a 4 day flush at you current stage and then chop, but considering your situation I would recommend chopping now and get the next run in - you already removed all the nutrients that can make the buds any bigger...