Ubiquiti EdgeRouter POE QOS Settings

I am using an EdgeRouter POE with my Comcast 150/10 Internet service The actual tested speeds are 180/12. Without QOS, my bufferbloat is "D" or "F" consistently. Enabling the EdgeRouter QOS with settings at 180/12 results in "A" bufferbloat, but my download speed drops to 90 and upload to 6. I also tried setting QOS at 170/10 with similar results. Can anyone recommend QOS settings for the EdgeRouter that will reduce bufferbloat without losing significant UL/DL speeds? Thanks