|Player||YEAR||REL ISO||ISO||LG ISO|
Hall's team scored 7.61 runs per game at home in 1876 and only 4.76 on the road. So his park might have helped him. But they allowed 9.09 at home and 9.00 on the road. Baseball Reference gives him an OPS+ of 204 that year, 3rd highest in the NL from 1876-99 after Barnes (235, 1876) and Brouthers (208, 1886).
Hall's last year was 1877 at age 28. His OPS+ fell but was still a good 132. Wikipedia reports he was banned from baseball for betting. The Baseball Library has similar information.