Also, keep in mind that a drop in 2lbs of boost isn't necessarily a negative thing. Boost is measured in pressure (psi) , so when you remove some restriction in the stock system you are allowing the air to pass through more freely. Think of it as a water hose, when you turn the faucet all the way on and pinch the hose you get more pressure since the passage way is restricted and trying to pass the same volume of water. When you remove the restriction you allow the water volume to move through the hose more freely but at less pressure. Now in a closed system like our beloved 7.3L's the pressure will continue to increase as the turbo compressor wheel pushes more air. But when you compress air in a fixed volume system like our engines you increase the compressed air temp as well.

In comes the new generation WW's. Designed to give us more air in the rpm range that we tend to drive in most of the time, instead of at the higher rpm range. So don't get to concerned about the drop in boost - too many time we see a drop as a loss. But if we are getting the necessary volume of air at a lower temperature then it's an even trade.

Edit: to expand on this - If you do a modification that results in slightly lower boost psi and you do not have any boost leaks then check to see if you also have a drop in EGT's. If you do the lower boost reading could be from lower EGT's which is a good thing.