It is quite the improvement! The paper is cheap too which is nice. Though I'd say it is pretty high effort for prep work between acidification, and pre-humidification or double coating. The results seem to be worth it and it is cheap.
There might be ways to improve the HPR results with classic cyanotype as well. I have not tried double coating it yet and I might revisit using a different acid for the first wash. The HPR paper is nicer than the Canson paper and it doesn't curl, but once matted it probably doesn't matter.
Like you said, what counts really is what the final product looks like. I personally don't care much whether a paper is supposed to be fancy or not; the question is if it works well! Looks like you found a winning combo, enjoy!
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