Basic math or simulation would easily answer all of these questions, please try and do some leg work on your own before posting to challenge the status quo.
I have two questions regarding your post:
1. Regarding the specc, isn't a 7/3/31 (with improved life tap and doom and gloom) better dpswise, with the 8% crit on BoD, and manawise (with glyph of life tap and this talent you cant get from about 20-30% mana to full in 3 life taps, wasting 1.5 seconds) ?
2. Regarding the stats priority, with the changes on ISF, wouldn't mastery be ahead of crit, having in mind they scale on each other?
Edit: One more question, why do you consider Glyph of Imp better than Glyph of Incinerate?