R23 scores are pretty much normal for stock 5800x3D with -30 CO. I've only seen 15500~ points either with a powerful cooler and/or with BCLK overclocked. I'm not sure about R24 (though they don't look like too low), so it's either something is running in the background, or you are temperature/power limited.
Did you set any PPT limits? Are you sure you are staying below 80C?
Check your power, temps and clocks on Hwinfo while the test running. Max core clock can hit 4450 but if they are not staying there that means something is limiting you.