I use less sugar in my mix, but it's a smaller container (2L, 2/3 full). I get around 2bps @ 72F depending somewhat on how much yeast I use. Yeast growth is exponential, so if you put more in, you reach higher numbers with more sugar in the water, meaning a higher bubble rate, but less longevity. I usually use a heaping 1/4 teaspoon. I inject into a lift tube under a powerhead, so there may be some venturi effect increasing the bubble rate.
I don't use the alternating, two container method as I have found that to produce too much CO2 for my little ten gallon tank. CO2 is plenty stable enough as long as I change the bottle every second week.
I tasted the "bath tub gin" that's left after two weeks once, and it really tastes quite terrible. It's kind of like moldy bread dipped in cheap vodka.