What do you usually do to fine tune your algorithm? Mine always seems to corrupt after some time even if I like and subscribe to specific channels. I have to delete all my history once a year or so.

Sorting would certainly be great. I'd especially welcome sorting by some kind of quality metric. The "thumbs down" count is not available via API anymore, but you could use thumbs up per views as a proxy, although that might require some reweighing, since videos with many views usually have fewer thumbs up.

You could also add another layer of voting on hackertube.org, so you'd get a more hackernews-focused voting signal.

added and pushed!

The site won't disappear (imminently, as I'd like to use it personally!) but head over to the about/ section and download the .zip with the underlying data, which I put up for this purpose.

Making a tvOS app of this, in the coming week. Will share the code on GH.