how massive? I can't always plan my crunches, but since I started taking caffeine pills - I take 4 pills, equiv 4 coffees, right before really focusing on something, then I can relax in a different part of the day where it doesn't matter if it's slower. So I go between 0 and 8 coffees per day worth of caffeine, depending on what I'm doing. I've completely stopped drinking coffee and save a bunch of time that way (except socially.)
How does this compare with what you called truly insane?
Consider taking L-theanine with your caffeine. When taken with caffeine, it smooths out the jitters and produces a subtle sense of clarity and focus; it will probably improve your ability to think on less caffeine.
If you are using caffeine for energy, you probably should improve your diet first, instead, and make sure you get enough sleep (which I know can be hard in crunch mode, but it makes your awake time much more productive). I love my coffee as much as the next person, but using caffeine to drive my ability to work has never produced good effects.
How does this compare with what you called truly insane?