Seems as if the lates addition to the spam-controls has done something for the comments section. Out of 128 attempts to post, only 10 resulted in a user-visible comment. Unfortunately, all 10 of those were spam and I have no idea how many of the others weren't. Currently doodling on a mod-queue system, so I can actually observe these things in a bit more "what gets trapped, what doesn't" fashion and actually allow me to experiment and tune the predictors.