Thanks guys, its always good to see these kinds of discussions. If the game randomizes park factors but they average around 1 depending on league size, I guess its "safe to assume" that if I do change them to suit my ballparks, maintaining the same average, I shouldn't drastically see a change in my league totals. But if I do deviate from that average, I should expect change.
Thanks for the csv export and parks.dat suggestions, I'll have to learn how that works.

More learning than actual playing, or are the two synonymous?