Missed this GPO setting, but you would need to change these for your connection:

Configure PCoIP image quality levels Enabled 

See the Explain tab for example values.

Set the Minimum Image Quality value (default value: 40): 30

Set the Maximum Initial Image Quality value

(default value: 80): 90

Set the Maximum Frame Rate value (default value: 30): 32

Use image settings from zero client if available Disabled

(default value: disabled; not applicable for soft client)