Continuing flowering after 1st havest

i know that u can remove top buds that r ripe & continue growing unready 1’s but still have 2 weeks of nutrient supply before flushing with fresh water but larger top buds look bout week away from plucking but dont want full of chemicals, how should i approach this eg start flushing, then remove ready 1’s then started feritising again to continue flowering cycle any advice appreciated

I would just make sure the PH stayed correct. No need to add more nutrients if all you want to do is give the 2ndary buds a couple extra weeks. Let the plant draw stored nutrients from the fan leaves.

thanks for the advice will give it a go