I took your wordlist and compared it against mine; there are a lot of (mostly really obscure) words that site knows that aren't on the version of the ENABLE list I have (which might be out of date?). The three words you had that I didn't which I actually recognized as words are a25vd2hvdywgbW9ub255bSwgYW5kIG5vb25lcgo=
The others are much, much more obscure --- a randomly selected one is ZW5vc2VzCg==.
Anyways, awesome regex. My technique was a lot less compact, writing fairly unimaginative, workmanlike python code to test out each of the individual criteria.