Hi,
I have a similar problem. I have set “Link quality” to 9, “Image encoding quality” to 9, “Disable multi-pass display encoding” to “true” and “Disable network-adaptive quality” to “true”. If I have a Libreoffice document where text has green background and yellowish font-color with strike-through, it becomes quite blurry and practically unreadable.
Are there any settings I might be able to change that would fix this?