The first level of understanding the sim is making a team then picking a park to fit it.
The second level is picking a park (like Palace of the Fans) and building a team to fit it.
The third is realizing that it's better to make a moderately balanced team, picking a park, then building the team around it with some measure of balance.
I'm pretty sure your "pretty good" Palace of the Fans team would be in huge trouble if it ran into a playoff series against an AFC team without home field advantage. For some themes you have to make those compromises, but in an OL you'd probably be better off with a pitching staff that can limit home runs enough to make -3/-3 not entirely necessary...