I do tend to power through 99's. With some skills I set lower goals (85, 90, etc). However the fact remains that when training a skill I've always just focused on the one skill until I reach the self-set goal. I do not necessarily use the fastest methods either, for example cutting yew to 99 woodcutting, so efficiency is not in a big factor in my mind. I am content to inch towards in whenever I am logged in essentially. Some people prefer to hop from skill to skill to mix it up, I have chosen an alternate play style.