Trashos The problem with your approach is the same as with software development before unit tests and "agile development". Your iterations are too long to let you come to useful conclustions about the builds.
So if you're that interested in build porno then go Beneath the Stolen Lands. This is one way to test the builds fast. The other way - up the difficulty to Unfair and go until the first rest at Oleg's. This is a nice way to weed out builds that cannot survive the first 5 levels.
What do you do? You construct the build, discuss it on the forums, spend some time with dumb people like me, then start playing the main game in earnest - and then reroll. You could have tested 3-4 builds during the time you're now spending on one.