Re: speed cobra and bass drum setup, adjustement for best results?
I played death metal. My batter head was fairly tight for rebound, my reso head was rather loose so as not to be so boomy. No pillows or such, but I did put duct tape on the batter and more with a cotton ball on the reso. The spring tension on my pedals were as high as they would go, my seat height put my thighs pretty much parallel to the ground. I would say 75% of the time I was running my feet, changing speeds and going from 16ths to triplets quite regularly.
This is what worked for me. It took a lot of playing and experimenting to find my ideal settings. Once you find your ideal settings, practice is the key to long and fast double kick runs. No setting will do this for you.