KTE, what last technique?

Your running this on a celeron with little cache, which makes your results not directly comparable but interesting! and your not running 32m so maybe theres a tweak or setting that only works with 32m, but i find that unlikely, if there is no gain in 8m its unlikely that theres a gain in 32m i think.

so you went from 10:48 untweaked to 10:15? thats a nice boost...
Are those individual runs? did you make each run only once?
Is this the average or the best results with each technique?

thanks for all the time you spent on this and thanks for sharing