#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 TheSennaj
And well yes, I'll enjoy the carpal tunnel and tendonitis, because trying to get one is clearly smarter than any word you have spoken thus far.