Baseball Past and Present conducts a very good interview with Bob Watson about his playing days. A sample:
Me: I was interested to talk to you ’cause you were one of the great Astros hitters of the ’60s and ’70s, and one thing that struck me is just you hit so well playing in a ballpark that was so tough to hit in. What do you think was your secret?
Watson: I used a 40-ounce bat, and I didn’t try to pull the ball. I used the turf. I think that playing in the Astrodome actually helped me because it allowed me to hit the ball hard on the ground and not in the air.
Watson is credited with scoring the 1,000,000th run in Major League history, and had a very successful career in other aspects of the game as well.
Here is Watson’s AVG-OBP-SLG for home games from 1966-78, which is almost all of the time he spent with the Astros
.290-.362-.422
Away
.307-.370-472
Given that hitters usually do better at home, it looks like the Astrodome hurt his numbers
As for his HRs, he hit 88 in 2453 ABs in road games during the 1966-78 period. That would be 22 for every 613 ABs during a full season. Maybe if he played in a fair park we could call it 25. Far short of 36