Zigbee2mqtt Group misbehaving

Am I missing something ? - I’ve got 8 external lamps which are fired from HA via Node-Red using movement and contact sensors. They work fine with the only issue being they are a bit out of sync now and again as NR fires them as single entities.
I thought I would experiment with a Z2M group to see if it improves. Trouble is, I can get the group to toggle the lamps on and off as a group but the brightness and colour temp of the lamps is nothing like settings shown on the z2m group screen.
I’ve got all lamps set to max brightness and warmest colour.
They all come on when I toggle the group but are at varying low brightness and none of them near to 100% brightness.
Any idea what might be going on ?

Set scenes for the groups. It works as expected.

Lovely ! Thank you. It does !
I had to setup the scene then minimise brightness and reset it to maximum for each lamp. Now works perfectly.

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Hopefully one final thing…
I notice if I reboot HA the scene is lost. If I go into Z2M UI and recall the scene all works perfectly again. Are you aware of any method to have a scene load as as as default ?