Grace similarly had a very up-and-down season in his highest scoring season of 1871:
First 6 matches: 181; 23, 98; 118; 178; 162; 49, 34* - average 120.37
Next 7 matches: 1; 88, 10; 4, 4; 15; 4, 11; 50, 37; 16, 43 - average 23.41
Last 12 matches: 189*; 51; 146, 21; 59; 0, 268; 78, 55; 31, 40; 0, 217; 23; 79, 116; 81*, 42* - average 100.83
I remember being very surprised when reading Leo McKistry's biography of Hobbs to learn that Hobbs only reached 3000 runs once - I'd always assumed 3000 runs in a season was like the 1000 runs/100 wickets double, with the top players between 1900 and 1940 achieving it fairly regularly and most decent county stalwarts managing to achieve it once or twice.
If you include List A matches, Gooch reached 3000 runs 4 times, including the record of 3986 in 1990; Cook 3 times, Hick twice and eight other batters once each.
It's notable that there were 10 occasions that a player scored from 3000-3050 FC runs in a season against only 2 that one scored 2950-2999, while the figures are almost reversed for FC+List A since 1970: no batters scored from 3000-3050; 9 times a batter scored 2950-2999.