I see your point and that lower limit will be in place it seems but I was looking at a different point.
If a side were to lose each of their first 4 away matches by say 20/30 rather than 10 then the redeclaration will have more flexilbility whatever the limit is.
With a 'brand new' average being acheived from those first 8 meetings rather than a rolling 20 the impact of any reduction would be greater.