#2
Tunings don't have a level of "heaviness". This isn't a question with a meaningful answer. Lots of people find tuning down makes it sound heavier, though, so if your amp can keep up I guess the lower the pitch the better? But in practice, not really.
#3
As much as he annoys me, this guy has the answer.

Quote by Axelfox
Please understand how little we as a community care