I'd expect to log into my account and see around 15-20 99% matches, which I gather is also unusual. I almost exclusively dated high 90% matches. I didn't engage in any clever strategy for answering questions, though I did answer a lot (> 1000).

The more questions you answer, the more 99% matches you get. If you and another person have given the same answer to many questions, OkCupid tends to overestimate your compatibility.

One idea to avoid this is to first answer a thousand questions, see which ones are marked as Unacceptable most often, and then delete all of your answers and answer only those questions and the ones you consider particularly important.