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This might sound silly, but I always start with the obvious. Does the boost gauge work properly?
For one thing, unless you've done some tinkering......you shouldn't be seeing more than 18 lbs of boost ever. The computer defuels the injectors above 18 lbs. Also, my F250 makes serious HP and it reads 2.5 lbs of boost at a steady 65. If I stomp on it I can get over 35 lbs. Perhaps your gauge just isn't picking up the bottom end any more.
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2005 E350 Standard Cargo Van, 6.0 PSD, 4.10 L.S., Quigley 4X4 New on 11-18-05
(seems to manufacture oil...)
Warranty Turbo 7-07 22,000 miles, Warranty A/C compressor 10-07 25000 miles
2003 E350 Extended Cargo Van, 7.3 PSD, 3.55, Quigley 4X4 New on 2-1-04
Some Pix
New Pix 9-12-2010
Transfer Flow 46 Gal*Delaminated*Replaced 8-06 UNDER WARRANTY
7.5' Western Snow Plow
BTS Tranny 9-29-07 @55,000 miles, Aluminess Bumpers, Mile Marker 12,000 pound hydraulic winch
2000 F250 ...... just cuz people are dumping them for the fuel bill. Got mine on ebay for $8749 with 116K on the clock.
1-1-09 BTS Tranny, 500+ HP at the rear wheel 
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