Don't give up yet, you're doing very well.
Now look at your rad: did you consider ducting?
Once you have a duct installed, I think you'll find better results.
Also, the hose running from the block to the rad: it may be pulling on the block, and lifting/tilting it ever so slightly, which would explain that 56C temp. You may consider giving it some slack.
You may have air trapped in the block, but I think that's unlikely, unless your flow is poor.
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