Tate Southisene is a month into his first full professional baseball season, and the Atlanta Braves should be happy with what they see. Now that he's had some time to adjust, he's performing at a solid level. Offensively, he's batting .271 with a .920 OPS, four home runs, 17 RBIs and 10 extra-base hits with Single-A Augusta. The 19-year-old prospect is showing solid plate discipline, even with the 24% strikeout rate. He's drawing walks at a 17% rate. Pitchers aren't getting an easy out by any means, even if they set him down on strikes one-fourth of the time. One the basepaths, he already has 20 stolen bases on 24 attempts, and it's the first week of May. He's averaging nearly one swiped bag per game. He's on pace to steal 100 bases this season, if he never misses a game. That's probably an unrealistic expectation for a full season, but it provides context to what he's already accomplished.…