One can never be sure until you have spent the time to try these methods out yourself ... bit like the medication forum! No short answers. I base my post in here on a number of years personal experience. ... and I'm still not sure about anything, however I do know what works for me with most of the above.
Good to see an interest in the topic. Best of luck with whatever you try and hope you gain something one way or the other.
I'm actually going to youtube some DEEP INSIGHT "Brainsync" whilst I continue to now draw.
Peace
Dave.