The Scouring. Six objectives, worth 1, 2, 2, 3, 3, and 4. The downside to that is that it's likely for one player to wind up starting on a higher value of objectives, which is pretty similar to just giving him more objectives in the first place.
This is a bit unbalanced, but less of a big deal in the core rulebook mission, because if one player has only a couple more points' worth, the other guy can even that out with VPs from Warlord, First Blood, and Linebreaker, and by killing FA units. If you're not letting those secondaries be worth VPs toward winning the game, Scouring tends to be more unbalanced than not.
At TempleCon my opponent had the higher point objectives in his backfield, and I was fortunate to be playing a flyer-heavy force so I had the mobility to get to them. At the end of the game I just barely eked out the win with my Helldrake on one of his objectives, my Overlord contesting another, and my two surviving Necron warriors on his third. My own backfield had been decimated so I wasn't even holding any of my own.
I still was losing by a point on objectives, but had killed two of his FA (well, one, and his Helldrake was off the table), and that eked me over the top.