Exposure scale values in Plotter

As I understand Phil Davis' book a normal grade 2 on variable contrast paper has an exposure scale value of 1.05.

Do some VC papers have a wider ES than other VC papers? Specifically I am looking at MGIV. If I understand the results in the plotter program correctly, MGIV with ilford filter #2 has an ES of 1.24. Does this soud right? If I use this in the calculation for my developing time I get almost a two minute increase. Ilford's filter #3 has an ES of 1.06 which is much closer to the suggested 1.05.

So, for those of you that have more experience here, does MGIV have a wider range than the "typical" VC paper?