@Keating, it's impossible to keep the sparkle in supporting a plugin for 3y and trying to overcome the various limitations of various hosting environments. We have a full test suite that we use as we try to not add features (quite often), but address core performance issues that only people with in-house teams can address.
Either way, lots of people have success and some don't and it's incredibly challenging to support users on forums because I can't see their settings. It never gets easier. A lot of people think minify worked well, but they don't realize how many people it didn't work for at all. There are plugins that do minify, but they do not actually do so in a way that scales properly, finding that balance is a needle in a haystack and I'm not satisfied with how things are going either, but rather than talk, I work.
Thanks for using W3TC, the final release (v1.0) (when it comes out one-day), won't have these issues obviously.