i havent made a whole bunch of strings but the ones i have made came out sweet. this is my observation, even with a flemish twist properly made should resemble close to round, this is with the right amount of twist in setting brace and after time to stretch. b-50 has the most stretch for synthetic strings. and of course , the more high performance string you use the less stretch you get. there are different bundling techniques that dictate how many twists per inch. all said and done the string is supposed to be close to round , the center serving makes the string completely round when done properly