Just an FYI... I found slow-commenter (with blogengine) was more reilable if I used proxies. (I just used the free proxies that SB scrapes, and fitered out the high-latency ones)
I don't think you actually need proxies for blogengine (as it doesn't have Akismet), but I tested it a few times, and it did drastically reduce the number of freeze-ups with slow-commenter
HTH