Zigbee Utilization 90%, normal for 130 devices?

Configuration Zigbee
2

If you go to the ZHA integration page and click on the three dots next to Configuration, then “Download diagnostics”…

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…when you open the downloaded file there will be a summary of channel usage (somewhere right at the bottom).

Here’s mine:

    "energy_scan": {
      "11": 75.96022321405563,
      "12": 10.914542804728702,
      "13": 85.82097888710312,
      "14": 89.93931580241996,
      "15": 96.64469941013013,
      "16": 87.33047519856483,
      "17": 7.659755505061292,
      "18": 10.914542804728702,
      "19": 2.84844209578687,
      "20": 82.35373987514762,
      "21": 4.15070068297423,
      "22": 9.713248103580147,
      "23": 6.789392891308996,
      "24": 6.789392891308996,
      "25": 0.792717332355823,
      "26": 23.33483723001185

I have ZHA with 60 devices on channel 20 and Z2M with 2 devices on 11 - so the number of devices doesn’t seem to make much difference.

If another channel is very low you might consider moving there. If all the channels are high there may be interference coming from somewhere - neighbour’s wi-fi?

There’s lots of good advice here, if you haven’t seen it already, but much of it relates to systems with dongles (I have an RPi with a separate powered hub and 2m cables to the dongles - difficult to do on a HA Yellow).