The only problem with taking measurements like brace height and ATA length so you can match them, is that they are usually wrong. Most strings will have crept anywhere from 1/2" to 2" or more, thus changing these measurements from what they should be. These measurements are important to take on a new bow that has the exact correct length string on it. If you didn' t take these measurements when the bow was new, then it won' t matter. I' ve also found that even on new bows, many strings are not the exact correct length. Most manufacturers do not make their own strings. String companies make them in bulk to the size given by the manufacturer. I find it best to go by string length stated by manufacturer. If it the exact correct length, then brace height and ATA should be fine.

I don' t think you can go wrong by making the string to the correct length with enough twists. I' ve found no decernable difference in the performance of a string with 1 twist per 2 inches compared to one with one twist per inch. Beyond that, the string is probably too long.