I think I can almost safely say that since the second my phone was updated to 2.0.4, the battery drain of 2.0.2 ended. Battery usage during 8-10 hours of sleep is now 4-5% with Wi-Fi on, 12 open applications and Android support running and 1-2% with Wi-Fi off, where it was 15-30% with 2.0.2. Nothing else changed, so it seems to be fixed.