Harvest in stages, anyone done it got any tips?

I plan to harvest my medical cabinet in stages, first by trimming the top layer of colas then lowering the light to the bottom canopy and ripening for a few more weeks then harvesting again. 60cm x120cm (2x4ft roughly) coco clay ball mix roughly 30% coco under 220w of led,

question relates to the feed schedule, how long do people flush for before harvesting the top and then how long do people ripen the bottom for on average ( I know there’s a lot of variables)? In terms of what they start feeding after the first harvest just wondering if people lower there ppms further or if they revert there nute schedule back to say week 5or6 and start again from there, I’ve never done a staged harvest before so any help or Input from someone that has would be much appreciated
 

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