While you should design a team that works well for your park, I wouldn't recommend going too far in one direction (i.e. only having fast contact hitters). Just my opinion, but you still need a team that can win away. A Tacoma franchise in my world (-4s all across) consistently got to100 wins the past few seasons, but only because he wins about 55-60 games home and 45-50 games away. I think fielding the best team you can should be more important. As long as you're better than the other team, then it doesn't matter where you play because park factors affect both clubs.