Re: harvesting top budz and letting the rest continue ??
The only negative thing is that your plant will stop growing for a while ,that doesn't mean it's going to die just kinda rest while it gets over the shock of you hacking it's top half off ! Other than that you and your plant will be fine and continue to pack more weight on those buds !!
I don't flush harvast the top but i change nutes and water every 7 days and add just water in between (every 4 days). I go with just straight water the last week but i really don't worry about flushing. Guess i should look into that more...lol