Descent G1 seems to have worse battery life than the Epix 2

The Descent G1 seems to have worse battery life than the Epix 2 I owned for a few weeks previously, under the same activity use case.

I know I will never get the quoted numbers form Garmin, thats not the point, its that the quoted numbers for the Descent G1 are higher than the Epix 2, yet I am getting the opposite.

 

Epix 2 - AOD off  - 16 days - I was getting just on 8 days

Descent G1 Solar - 21 days - I am getting about 6 days

 

Pulse OX was off for both.

I am using only built in watch faces, no IQ apps installed, and this is with no diving activities on the G1.

Despite this I really like this watch, I have always owned Fenix's since the 3 up to the 7X.

But decided I wanted a watch that I could use for everything, including diving, hence the change to the G1.

 

Any thoughts or others can share their battery life experience ?