L-Band
Did you work for the same Leeds based Cessna outfit where we got our 3 x 404's maintained back in the 80's? Chief engineer called Brian something. He could tune those engines to perfection. He advised only to buy Teledyne re-manufactured engines. They were expenseive but we NEVER pulled a cylinder in 7 years of operation and ALWAYS got 1920 hours from the engines 1600 + 20%. The trick was to use only about 1 or 2 power changes for the entire flight, difficul, but if planned properly worked out well and never go below 20 inches untill on the ground.
The "gitsos" are great engines if you know how to handle them, the main weakness I seem to remember was weak starter clutches that should be changed at the first sign of slipping before bits fall off it inside the engine.