I support this issue.
Simply tried it wit "Calc.exe" and 99999 N! on Windows 8.1 64bit.
I reduced the "Trigger High" to 20 (because Windows 8.1 tames it to 25% per Default), but the ProcessTamer did not come in Action.
I tested it with an 32-bit application (CpuEaterVs), too. Here the taming works.