Hey I don't know for sure but with about 3-6wks left won't that produce alot of seeds? I had a blue widow hermie on me late into flowering. I let it go a week maybe a week and a half. and I kinda got quite a few seeds from all the nugs that were underneath the nanners. Im just thinking with that much time left does the OP need to worry about getting all seeds? or does it take alot longer than that to get that many?
Also shouldn't you be pulling off the nanners as they grow it. THey will come back but if you keep plucking them it prevents more pollen being dumped into the room
one more thing that Im not positive of Im just raising the question, if you let pollen freely float around in your tent/area for that long that gives it time to go into fans, lights, floor, walls etc... Will that be a problem in future grows? After my plants were done I scrubbed everything for this fear the pollen would still be around to pollinate my next batch.
Im not an expert just thinking out loud maybe someone has better insight.