Max Fly speed bug or noob error

Hi all. I’ve set up an Archviz project and have set up controls so you can walk or fly around the structure.
Everything works as it should except the Max Fly Speed setting which doesn’t seem to allow me to set a Max Fly Speed over a predefined limit (which is unknown but appears to be around 500).
The key press set up definitely works as when it is released the Max Fly Speed does reduce to the lower value (300).

Does anyone know why the Max seems to be limited? I have tried to increase the setting directly under the Character too but again it only seems to change if below the default 600 value set.

Any help would be great as it’s driving me crazy. I’m relatively new to UE4 so it could be something really simple!

How about this:

?

Thanks for the suggestion but unfortunately I’ve already tried this and still no joy. Even when putting crazy values in both the deceleration and/or max fly speed, still results with a capped speed (around the standard walk threshold).
The walk speed settings work perfectly but I was really hoping to implement a flying thrust too.

Is there any other way the flying speed could be capped? Does my blueprint coding look ok to everyone?

Just in case anyone needed an answer to this, I found the problem.
Turned out to be that ‘Default fluid friction’ (Project settings>Engine>Physics) was set to 10. Changed to 0.3 and all is good.