Disclaimer: I'm NOT an expert
1. I'm going to guess its the lower temp and LED not drying out your soil so quickly.
2. I wouldn't rush this grow just b/c you messed up (I understand but wouldn't). You may have less yeild or it may take longer b/c of the stunting, but that beauty you have there is more than capable of producing fully (or close to) potent buds.
3. Get a scope!!

I know, I know, it seems everyone is always suggesting to buy something but a scope is the best way imo of determining when youre plant is done or done to your liking. Its a little tricky till you get the hang of knowing what to look for, but its well worth the investment. You may (should) also look at Muddy's sticky thread about using the leaves to tell you when its done. According to that you will have about 3 weeks left once the main fan leaves start yellowing and falling off due to end of life. I don't even see that happening yet on your plant. The only potential problem with this method, imo, while its a great method, leaves can yellow or die off for many different reasons. Or if youre an idiot like me, and burn the shit out of your fan leaves by foiler spraying them with a WAY too high concentrate of nutes, there won't be any leaves left anyway.
4. Flushing to Cleanse - I say one week only b/c I like the idea of giving my plant one extra boost of nutes

. 1 or 2 weeks, personally I don't think it matters much. Its to help with the final taste. If I were using "non-organinc" nutes I would probably lean towards 2 weeks. I've done 2, 1, and none w/o really being able to tell much difference, but that's just me. There is a lot of debate and plenty of threads on this subject.
5. Sampling - I wouldn't mess with the Main Cola, you can I guess but... idk, you just don't mess with the Cola!

. Anyway, you can pretty much take a bud from anywhere else and sample it. Just cut it off at the base of the bud stem. I usually try out the bottom popcorn buds if I do it all. My plants are usually so small I don't like to sample much. I just throw mine in a vape. If you don't have one, you'll have to use a quick-dry method.
Hope this helps or makes some sense. You're doing great Kill. I just know that's going to be some killer smoke when its done.
Btw, I haven't (or missed) seen any comments on the smell. How is she smelling right now? Having any problems hiding the smell?