rule sets and field dimensions

[rsl]

I am a regular reader on the Basketball forum, but this is my first post here. Sorry for the newbie question.

I find myself responsible for a church owned softball field. It currently has bases that are 60 feet apart, as per NFHS 1.1.2 for a 12 inch ball. Some coaches in our league want to move them to 65 feet, as per USSSA rules. I don't have an ASA rule book.

What field configuration and rule set is best for a low key rec league? The field is used mostly for men's slow pitch, with some youth games (also slow pitch) thrown in.

I am leaning toward the NFHS rules, since the field is small. The plate is only about 20 feet from the backstop (instead of the required 25), and the infield extends only 52 feet from the pitching rubber (instead of 60 or 65).

Do you guys have any recommendations for a newbie?

Thanks!