There is an easy solution for beating "What Is Noble?" (Campaign 6, boss level) at 100% challenge, which is also rather fitting, I think. The basic idea is to stretch out the waves as long as possible, so the path closes and you win before the wave of Brothers Bavakh arrive. Now a detailed description. All points will be assumed to be lvl 7. First deploy all your love points anywhere. Next deploy both circuit points next to each other along the rim. These will be used along with the path cursor to surgically take out zig engines and nightmares and to do clean up. Then you want to use enough firepower to be able to take out a wave quickly, but not so fast that it will accidentally kill all enemies in the wave. A fear point and a pride point works pretty well for this. Deploy the fear and pride points at the start of each wave, wait for them to kill everything except the last couple enemies and then sell them before they do. This way the last enemy is left going down the path and eating away at the timer. If it gets to close to the exit you can kill it with the circuit points. Since the jumpers and hoppers are fast you should just kill them outright.
I actually only beat that level because of the random Blaggenthorg spawns. I got really lucky and blew up around 10 of the Brother Bavakh enemies with one. I then got even more lucky and blew up ~6 Panopticons with the next one. I made it through the level with one life, then went back on 00 difficulty to get 100% success.
What I'm interested in though, is how long ago that email was. I want to see how many years I was behind.