DDJ-FLX4 Low Output Volume

Hello,
I recently purchased a DDJ-FLX4 as I require to have a portable controller and I noticed that the output volume is quite low in comparison to my XDJ-RX2.

For the DDJ-FLX4, Rekordbox settings I have Output Level Headroom -6db, and my Master Level Knob is about 2'clock. I am connecting my controller to a DJM-250MK2 Mixer and I can see the levels only turn on the -12db LED. 
Changing the settings in Rekorbox for the DDJ-FLX4 LEDs to show the Master Level, I can see both Green and Yellow LEDs ON. If I increase the Master Level Know in the controller I can see the RED LEDs flashing, which I would like to avoid as this will mean the controller will be clipping. 

To be able to get a decent level on the 250-MK2 Mixer I need to setup the Channel Trim, and all EQ knobs at 3'clock. This settings allow me to see the 6db Yellow LED ON in the mixer.

If I compare the Master Output Levels with my XDJ-RX2, having the master output at 2'clock, with the yellow LED ON between 3db and 6db. The 250-MK2 Mixer has similar LEDs ON, between 3db and 6db with the trim and all EQ knobs at 12'clock. 

Is it normal to have such big difference Master Volume Output between both equipments?

Is there a way that I could increase the Output Volume in my DDJ-FLX4 without clipping? (If I modify the headroom settings in Rekorbox, I need to turn down the Master Volume to avoid touching the Red LEDs).

Thanks