Recording from rekordbox sounding tinny

Hello,

I'm trying to record a mix from rekordbox, but it is coming out tinny, with too much high end and not enough low end. I have tried literally tip and trick I've seen online to fix this including:

- Making sure automatically optimize audio level of a recorded file is NOT ticked

- Making sure output audio from the computer's speakers is NOT ticked

- Making sure auto gain is disabled

- Having my level next to the record button set to about 9 o clock

- Having my channel trims just entering into the orange at the loudest points

- I haven't touched any of the eq settings and all my eqs are at 12 o clock

- Using FLACS

Can anyone offer any advice on how to fix? It's driving me crazy that I can't record a mix in decent quality! I can send an example of the record quality versus original track quality if that would be of use?

Thanks,

Nathan