I have never found 113-128 to be tougher than 97-112. They used to be listed separately in the catalogs, but I've found no factual basis to support that they are tough. The PSA pop report strongly suggests that they are not tougher (
https://www.psacard.com/pop/baseball...an-color/34128), which is not gospel, but difficult to manipulate in this quantity when they're all 250-300 straight grade pops for commons. Very large sample size of this series.
I don't believe this old myth that they are tougher; perhaps the pack out meant some areas only some parts of a sheet in greater quantity than others, but on the whole, there's no real quantifiable evidence that suggests they are actually tougher. Also, it just doesn't pass the common sense test that half of a sheet would be scarcer.
A lot of things are said in the hobby that contradicts actual data and doesn't pass the smell test. This one should be put to bed, I think, unless non-subjective evidence can be mustered.