Drag Week Help

Drag week is going good, but I need a little help. Car just went 10.54 but only 119 mph, should be 129-130 range.

414 small block with B1SC Procharger 9 lbs of boost, Cope racing 904, Ultimate 5,000 stall converter

Wondering why it’s falling off on the big end. Somethings wrong bc it’s gone 128 before. Getting full 9 lbs of boost, air fuel good

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