Came across this. Using the data here the most points a side has had in league one after 30 games and been relegated is 27. However both the Wimbledon Travellers Association and Oldham have exceeded their targets as well. In any event if we go down with 33 points after 30 games it will be a record by a considerable margin, at least with the data supplied.
https://experimental361.com/2016/01/07/league-1-in-gifs-promotion-and-relegation/