Look at the angle from the pinion (the flange on the rear end) and the rearmost drive shaft. there should be very little angle here.
If I'm understanding you correctly.... going from front to rear, you have:
1st Drive shaft exits the transmission ---> angles down towards the first carrier bearing
2nd drive shaft exits the first CB ---> angles down towards the 2nd CB
3rd drive shaft exits the 2nd CB ---> angles UP towards the rear end
If this is how your system is it sounds wrong to me! each time you have a joint you want to minimize angles. In an ideal system your pinion should point directly toward your transmission output and the driveshafts should be in a straight line between the two.
Sometimes things will be a bit different from the ideal, however I can't see going down and then back up unless you are going around some really strange stuff on the chassis or perhaps your pinion angle is set wrong. (down)
Some other things to consider:
--You should have your U-Joints all alligned in the same plane, (all of the bearing caps on the large side pointed down)
--How does your pinion angle change through the suspension cycle or under load?(shouldn't be much!) Are there any loose suspension links that allow unwanted movement?
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