Was reading something on this subject last nite, thought I'd throw it into the mix if it helps.
A baseball capper wrote that the walk-to-strikeout ratio was more important than the umpire's avg runs or "over/under" numbers.
Said if the ump has a walk-to-strikeout ratio of over 2.2 or under 1.4 it could be seen as a significant advantage to totals bettors.
But he would go back a couple of years to check consistency with the zone from that ump (maybe that changes this year with the "new" zone?)
Hirshbeck's stats reveal that batters better go to the plate swinging. There's an avg of 14.4 strikeouts per game and just 5.1 walks per outing; and a walk-to-strikeout ratio of 2.8 to 1 - which has been consistent thruout his career.
Have tried to compile this chart of some "over" and "under" umps thru June 12:
Avg Runs Games U O K/game BB/game K/BB
Over:
Culbreth 12.27 11 2 9 12.4 7.8 1.6
Phillips 12.50 8 1 7 11.1 6.5 1.7
Higgins,S 12.88 8 1 6 13.3 8.8 1.5
Under:
Emmel 7.85 13 3 10 13.5 5.5 2.4
Hirschbek,J 7.43 14 3 10 14.4 5.1 2.8
Hirschbek,M 7.29 14 3 11 14.9 7.9 1.9
Guccione 8.29 7 1 6 13.7 8.0 1.7
Hope it helps a little/generates further discussion
GL guys