Every single parse I've submitted has had two BLM. Drastically reducing the amount of AoE & duration of adds being alive, while having the effect of drastically increasing parse times due to overall lower single-target DPS. Despite this my parses are still sitting atop the leader boards. As I don't play massively better than anyone else I'm going to attribute this to better itemization.

For reference, the parses I submitted; Note every single one includes two BLM.

T10 560.4 http://puu.sh/gpd2W/9410c9730c.jpg
T11 545.7 http://i.imgur.com/BkO4jpv.jpg
T12 590.5 http://puu.sh/gpjX5/9ad67b3b8f.jpg
T13 514.3 http://i.imgur.com/RhQArlx.png