I remember reading that you want to keep your reps low, but maintain good form with fast movements as to minimize usage of your slow twitch muscles as your power is in your fast twitch muscles.
Something along those lines... I've noticed TREMENDOUS strength gains by doing this:
10, rest, 8, rest, 6, rest, 4 - done all under two minutes.
Use that formula if say your max reps of said weight was like 15-18 in one nonstop go. Obviously increase the numbers if you can do more, and decrease if you can't that much.
Concentrate on good form and it's harder than it appears for things like pull ups. It also dramatically cuts down your routine times, but maintains the same effectiveness. It's a routine designed around burning fat, and maximizing strength gains, not necessarily bulking...but you can get bigger doing it. It's what I've been doing, albeit with bodyweight exercises and have gained decently with my strength through the roof (relatively speaking). In a period of a month, I went from not being able to do 3 pullups, to being able to do about 80 various styles in a 30 minute time span.