I've seen plenty of 45y targets with loads of misses high, strange.
30mm are great as they are usually uncommon (people prefer to stick 25mm out instead) and catch loads out as they are not used to them, going high.
Course setting itself, especially for HFT, is hard to do right, it's easier just to throw targets out to get people to miss, especially since 25mm were put out to 40,
That's why IMHO we need to make it appealing to bring targets in, not encourage more that's thrown out.