I simply went with the 4 parks with the lowest combined ballpark ratings, without having any rating at 10 or higher, so that there was no way you could have a hitter get 50+% BP Singles or BP HR rolls.
Petco - 1/1/1/1 = 4 of 80
Jacobs - 5/5/3/3 = 16 of 80
Dolphins - 5/5/9/3 = 22 of 80
Tropicana - 8/5/9/6 = 28 of 80
SAFECO had 22 (but a LH HR Rating of 14)
Dodger had 24 (but 2 BP HR ratings over 10)
Kaufmann had 27 (but 2 BP Singles ratings 10 or higher)
Busch had 28 (but a 11 RH Singles rating)
Angels had 29
Turner had 32
Comerica had 33 (but a 13 LH Singles rating)
SBC had 34 (and a 16 RH Singles rating)