Not as if I ever soloed Terror *lol* but here are some things I do:
* Build a good spell rotation. A raid optimized rotation doesn't need to be the right one for soloing phat mobs. Try to build your hate gradually, starting out slow, and leave Lifetap for when the mob drops 10% ish. This should allow your pet to pull way ahead of you in hate terms, and lets you nuke more freely later in the encounter.
* Bats, keep em going. A mob with less defense is going to get hit more by the pet, and thus, he will build more hate.
* Cast pet into offensive stance and proceed to stun and then fear the mob. It's just a few seconds, but the pet will do a *lot* more damage, and thus rise his hate.
* When going into the fight, give the pet some seconds to build up aggro before you start casting anything that's going to build you a lot of hate.
* If you're anything like me, and hate dead times where you can't press any buttons, interleave power taps, or any other spell that won't build hate into your rotation.
* Try to spread manipulation spells out in the rotation, as they seem to build quite more hate than you might think. On medium to slightly-hard mobs, a manipulation spell every 2-3 damage/other spells seems to work fine for me.
* Use consumption early and often. If you can, use it while doing the dumb-offensive strat from above, as it will proc 3-4x as much.
* Love your dumbfires. They have their own hate list, as long as they live. Keeping Perceptos Command up for the right moment can prevent you from dying when the pets pop back into the void.
* If you're quick at it, try to build a pile of corpses nearby, and cast UH as soon as the pet holds firm aggro. Corpses, even if you don't loot them, will dissapear within a minute (aprox, haven't precisely timed it) or less, so be quick. You can also kill lower con mobs and pull the big guy to the right spot later.
* Try to use LB. This is rather complex, as a weak pet *won't* hold the mob on such a burst. Judge for your self.
This is just from the top of my head, I bet I missed something

Even if some, if not most, of these things may seem silly, or may not seem to do anything at all, the sum of all the little details is what turns a loss into a gain.