Now that I hit 120..

I have a few questions:

A) My range is greater than everyone in the 12X's and greater than 70% of the people in the 13X's at 120, where should I train? (~424X, I would post a SS but maple is down as I write this)

B) Im in a guild that Zakum runs twice a day, and CWKPQ's twice a week, but I still want to be able to train. Would getting 21 DS, then 21 Barrage, then 30 DS, then 30 Barrage hurt me? (So I have both Single Target + Multy Target early on)

C) Is it actually possible to train with DS in a way where you dont get hit? I talked to a 158 bucc, a 150 bucc, and a 132 bucc, and they all said that its impossible. I kind of hope this is so and hope this is not so:

• If its correct, Im correct
  
• If its wrong, I can train more efficiently but im still an idiot for not figuring it out.
  

Anyway, all help is appreciated guys, thanks.

For B), is that including 11 SI and Time Leap points? Because if you're CWKing and Zakking, those will be pretty important.