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)