I didn't notice any RMI interference on my J600 with the screen fitted directly to the front cover. If you have that much metal-metal rubbing at the front of your turbine, its time for service! You should not have any vibration there.

No thrust lost or increase EGT with the small tea strainer fitted as shown in the first picture. The overall air flow into the turbine is still sufficient for normal operation. Actually, that particular F16C was lost due to structure failure at the right wing root during high speed pass (recorded 260kph).

B777