What is the correct SPL for LFE?

What is the correct SPL for LFE?

I have my speakers calibrated as follows:

Satellites: L, C, R, LS, RS, etc. at 85 dB

Subwoofer: 95 dB (+10 dB)

Reading the Dolby Atmos guidelines, we set it to 91 dB (+6 dB)

The LFE channel’s acoustic output is required to be 10 dB higher across its frequency range compared to the center speaker (sometimes called +10dB in-band gain). When calibrating the LFE channel in a room with a 85 dBC monitoring level, the LFE channel should measure between 89 – 91.5 dBC on an SPL meter, and be capable of at least 23 dB above this level to prevent distortion and allow additional headroom for equalization. Multiple subwoofer cabinets may be required to achieve this.

https://professionalsupport.dolby.com/s/article/Dolby-Atmos-Music-Studio-Best-Practices?language=en_US
 

But Sound ID Reference still tells me I'm too loud.
 

What does the +10 actually mean in Sound ID?
 

What should the SPL be for all speakers?

What happens if I leave the option for equal sound for all speakers?

I almost always get a +6 dB error on the subwoofer. What can I do? Can someone clarify the SPL workflow for all the speakers before calibrating? or is it a sound id bug?

Then Sound ID lowers the volume on the master and in each speaker group. Should I leave them like that and then increase the SPL in the master control? How far can I adjust the safety margins?