Haha, I never expected it to work well in stock A2. I think build up time is mostly a function of the build list and build time handicaps, but there's definitely an influence from the timing and size of attacks as well, which is indeed governed by the other AIP files. One of the things I wanted to make sure was that the AI wasn't losing ships faster than it can build them, because otherwise it can never progress through the build list.
And of course you can use my AIPs, you can use anything from my mod, as long as you credit me. Good luck with your project!