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You are doing the right thing. The Spicer is a synchronized transmission and they really do not like clutch-less shifting. In fact, Eaton, the makers of some 80% of the heavy truck manual transmissions, ask the operators in their manual to please clutch/double clutch their unsynchronized...
Before you hit the fuel or turbo, check the throttle linkage and make sure that full throttle means the IP commands full fuel. Mis-adjusted linkage or even a bent pedal can cause the IP to never go wide open.
Even with the C-turbo you should get at least 7 psi of boost! My (brand new) D makes...
Yes, fresh filters, you might consider back blowing the fuel lines from the tank with compressed air with the filters off. Fuel will spray. Gunk might come flying out. A quick check of the copper fuel line that crosses under the radiator (sometimes it gets crushed) and then re-assess top speed!
Sharapnel, look at this thread regarding the trunnions: https://www.steelsoldiers.com/showthread.php?71520-preventable-rear-suspension-failure
Post #30 in that link has more info, including a link to gringeltaube's pic on putting a grease zerk in the cap.
Open up the trunnion caps as well, do the grease zerk mod and see if you have bearings or bushings and if they are still ok! Easier with the wheels off.