1. Defoliation.. sure, there is a time and a place and a reason to do some leaf maintenance, especially with lower light, lower plant (T-5, CFL grows).
2. Flushing vs Not flushing...... Flushing is a corrective action and should be avoided unless needed. At the end a flush is fine if it makes one feel better, however I prefer to just back off feedings a bit at the end.
3. Superthrive.... Does praying help? If you think it does it might. Take it or leave it. I'd suggest mostly for cloning if that is all you have for a bit of hormone, and then you can clone fine without it anyone. *If you do use Superthrive, when I played with it, it was awfully acidic, make sure you are PH'ing if you decide to use it. I'd also on a gut instinct not use it once you have established flower. Although I doubt it would matter one way or another significantly.
4. Molasses ... ya, ok.. whatever.. there is a bit of science as to why it can help, there is also reasons it can hurt. If you use it make sure it is soil (or at least not hydro.. I've read cat's doing that.. ick) and maybe save it for the last few weeks. It is VERY acidic and even with a lot of lime in your soil and PH'd water, it will drive your soil acids way up when it starts drying out.. so if you use it, less is more, see how the plant responds. I only know one fact about the stuff.. different plants respond a bit differently to it, less is more until the plant tells you how it's grooving.
5. My turn.. ha, never give a guy like me a turn.. I'll talk shit all day long and you will never get a word in edge wise.
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Those are my takes after many years of tooling around... I have the luxury of not having to grow anymore for awhile.. but when I did and will again, my final conclusion is once again, less is more. Grass likes good soil, not to be water stressed, reasonable light, enough to eat to grow and not much more.
Everyone else's own mileage may vary, there are a ton of techniques and a ton of neat ways to grow excellent grass. Patience, less is more and hands off as much as possible.. that's my shtick.
Peace..