Steelbird
The contaminated runway corrections for all weights are based on runway limit weights. Looking at the long winded method in an AFM, you have to enter with the runway length to find the applicable corrections.
There was a very interesting procedure in an AFM dated 1973, it doesn’t appear in the modern AFM, it states:
At a speed of VR-10 Kts, lift the nose wheel off the runway, accelerate to VR in this configuration to reduce drag. Does anybody actually do that??
Mutt 