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I currently solo T3, and I can solo T4 onlyslightly slower if it is a "good floor" and quite a bit slower if it is a floor filled with A5 mobs, for example.

Group play /w one other person makes T4 very straightforward.

What is the prevailing opinion on bounties? Run at same difficulty as you rift for best exp/gold/leg chance? Or just farm them at T1 for the access to Torment-only drops and crazy speed?

I prefer to do them at the same difficulty I rift. Just because of the combination of higher gold/exp/leg chance on mobs on the way since there are so many chests/goblins. I didn't feel this way prior to 2.0.5 though, I just wanted to get bounties over with. But now that 2.0.5 doubled drop chance, I see a good amount of legendaries when completing a full act of Bounties.

Same as above, unless you're in a mad hurry to get into the rifts, extra drops/exp and gold on the higher runs.