WW doesn't work in SYN leagues. I've played in at least a dozen of them and commished half of those. IMO, the AAA we're getting is too strong for a SYN league.
Teams trade because they have to. My guess is that 20 owners will make trades in this league. And yeah, some may appear lopsided. You might trade 1998 Mark McGwire for a 250 IP inning eater because your team has 4 $9m first basemen but only 700 IP. Similarly, someone might deal you a great RP for a backup catcher, because he has other great relievers, but only 300PA in catching.
Things of value in this league are relative. The nature of the league is to give someone too much of one thing (catchers, innings, relievers, PA) and too little of something else (quality PA, quality IP, etc). The inbalance creates a need to trade.