WTF, Max rate turns at 100'.
That's stupidity. There's no need for that sort of thing.
I haven't read the Part 61 low flying syllabus requirements recently but I doubt there's anything in there that requires this. If there is, I know one instructor that's not going to do it.
I bet the topdressing guys who operate at low level, day in day out, don't even do max rate turns at such a low level.