2005 Chevrolet Avalanche 5.3L V8 P0332 and P0327 Codes at 60mph - Diagnosis and Fixes

I own a 2005 Chevrolet Avalanche 1500 with a 5.3L V8 engine, 4x4 drivetrain, and currently have around 85,000 miles on it. The vehicle consistently triggers both DTC codes P0332 (Knock Sensor Circuit Bank 1) and P0327 (Knock Sensor Circuit Bank 2) when driving at approximately 60 mph. The issue appears to be intermittent but reliable under these conditions. Here’s what I’ve already tried: 1. Replaced both knock sensors (Bank 1 and Bank 2) with ACDelco units, including the associated wiring harnesses. I also sealed the sensor mounting area with RTV sealant and replaced the intake manifold gasket to ensure a proper seal. 2. Performed a full spark plug and wire replacement using ACDelco components to eliminate potential misfires that could interfere with knock sensor readings. 3. Replaced all oxygen (O2) sensors. 4. Cleaned the Mass Air Flow (MAF) sensor. 5. Inspected and cleaned all ground connections, ensuring solid contact points, then applied electrical grease to prevent future corrosion. 6. Removed the ECM/PCM for 10 minutes to check for internal corrosion or wiring issues in the harness. 7. Cleaned the throttle body and replaced the air filter as part of a broader intake system maintenance effort. Freeze frame data from the vehicle’s diagnostic logs shows no signs of severe engine misfires, knocking, or other abnormal conditions that would explain these codes. Despite all these steps, the P0332 and P0327 codes continue to appear. I’m wondering if there's any overlooked component or procedure that could be causing this recurring issue—especially given that the knock sensors are functioning but still triggering errors at high speeds.