Outwell Annatto stove

[Kemper-van]

Hi all,
We recently purchased an Outwell Annatto because it can work with EN417 cartridges, but I find it very difficult to regulate the burners. It seems to be all or nothing.
It’s also hardly visible to see it the burner is on or not (very small hardly visible blue flames).
The gas canisters also empty very fast, at least much faster than I would expect based on the specs.

Anyone in here with experience with an Outwell Annatto stove that can confirm this is normal behaviour of the device?

Thanks in advance!