BB60C for evaluating a wifi devices

We are developing devices with Wi-Fi (2.4 + 5 G)

For pre-certification tests, we chose the BB60C device to check power, SEM, EVM. But we face a problem during our tests: the program shows only the current EVM, but not the worst value.

But most important problem: we almost always do not pass the SEM test on BB60C with a device that has already passed these tests (with a huge gap) in the certified laboratory.

Can you give recommendations on the best configuration of the setup for testing Wi-Fi solutions (SEM/EVM/power)?

Our devices operate with a power of 12…24 dBm, 20 MHz.
To avoid the risk of damaging the spectrum analyzer with high power in the middle of the chamber, the device is connected by wire after a 20 dB attenuator. The settings in the software are visible in the photo. Additionally, we have made losses on the attenuator in the corresponding menu. In the official software manual I saw a note about -50 dB. Maybe it’s worth increasing the number of attenuators to -70? Maybe some specific software settings?

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