Given that you had a hard time keeping her up above 50, I'm glad you went with the 0.5 unit reduction. The other thing to consider is Bell's special circumstances - IAA seems to be losing it's tight grip. That means a good dollop of caution. With Neko, when she started the downward slide, I kept up the 0.5 unit reductions until she stopped holding them, then switched to 0.25 unit changes. That was below 4 units. Note for any lurkers. Seth and Bell's circumstances are unique, do not follow what they do.