A proper set-up - 100% sealed tent, adequate sized carbon filter, and proper airflow you can knock out around 99% of the odors. But here is the problem, it is tough to get it right the first time - it took me a few tries and some tweaking my system before I got it 100% right. And unfortunately...
I can't say conclusively, but my default is always to assume a noob overnuted their plants when everything else looks good. I think your next grow is going to be 100% better, but please keep an eye on the nutes and always err on the conservative side.
My fan leaves have always died off as the plant moves through flowering. Not sure if it is natural or if they just get blocked out from the light or what, but they slowly wither away starting with the bottommost first. The rule of thumb I go by is when a fan leaf is more then half yellowed I...
I don't have them in the same room.
Do a search on here for Ona and I bet you find a million threads with your answers in there.
Like this one: https://www.rollitup.org/indoor-growing/90893-ultimate-odour-control-thread.html
It is anything but a "masking agent". As you said, it neutralizes odor. The stuff works great for my house, I use a carbon filter in my room though so I can't answer that.
The stuff I have is Fresh Linen. It smells great....like fresh linen.
Hard to tell with that picture. Have you ever reset your white balance? Most half way decent cameras let you do that. That allows you to take good pictures under an HPS.
Here is another little mention:
"As an example, some European cultivars of grapes represent clones that have been propagated for over two millennia."
http://en.wikipedia.org/wiki/Cloning
Yep, Some strains of grapes have been cloned for 1000's of years. It isn't the actual act of cloning that causes the problems - it is all the other hijinks mentioned in this thread.
Get away from thinking light per plant - try and think sq ft wise. One person might have one large plant or 16 smaller ones in a SoG set-up to get the same yield.
Years of experimenting by thousands and thousands of growers have shown that the most efficient set-up is close to these.
Anything...