Delaying Senesence?

In my long experience (40 years), a staggered harvest never works. Just chop the lot and accept it for what it is. Once you remove the top main parts, the plants go into shock, then take forever to grow out the lower smaller buds which never turn out as good as the first pick or even as good a had you picked them slightly early and under mature like when you harvest the whole plant at once. Google "lollipopping cannabis" and you can avoid these issues in future grows.......I am a big fan of it and it makes life a lot easier! You still have 3-4 weeks to go, but I guess you know that already! Also, always clean up/remove any dead fallen leaves, left lying around and rotting makes them easy pickings for pests and diseases. Good housekeeping when growing indoors is one of the "Golden Rules"!