I think that discomfort/soreness is supposed to happen, or we wouldn't be doing ourselves any good. By definition, you HAVE to injure the muscle-the muscle grows when it repairs itself. The thing is, severe pain is not normal, even if it goes away with meds. I tried for several weeks to do what I thought was a reasonable weight for the lat pulldowns, and was killing myself. Lowering your weight on a specific exercise that's bothering you the most won't be that bad-just get a feel for what's right for you.
I really don't feel like you have to lift such heavy weight and "max out" to get the metabolism going. I am only lifting about 60% of my max and doing 3 sets of 10, and it has DEFINITELY increased my weight loss since before I started lifting.
Don't get me wrong....I've only been lifting for about 10 weeks now myself, and I know that eventually I will have to severely increase my weight to get results, or else I will just basically be doing cardio-but as a "beginner" I only go up in 2 pound increments at a time. You never said how much you were increasing, but I think those of us less experienced in this risk injury by going up too much too fast. I started this never having lifted weights before in my life, so I'm more concerned about not hurting myself than maxing out-but that's not everyone's goal with this, and I don't know if this goes against the BFL guidelines-just tossing in my 2
