Interesting about that porro effect upon apparent magnification, which I have not heard about or spotted. The forum has been very helpful, except that in my case it provokes new urges - latest has been belatedly to try a Sightron BSII clone, Kenko OP 8x32 DH II
https://www.amazon.co.uk/gp/product/B004DYQRME/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
This Kenko is black rather than green in colour but still in 2018 it turns out to be as good as nearly everyone has already said (so many times!). It's smaller and lighter than the earlier favourite Pentax ED 8x32 mentioned above. I think the Kenko DHII (not necessarily the same as its predecessor, the earlier/cheaper non-DHII version) is very slightly sharper, sparkle (contrast/colour?) being much the same, and is almost as easy to use, although perhaps it has a marginally smaller FoV. Nevertheless the Kenko is still not quite, as I remember it, as sharp as the other forum-recommended porro (FrankD again being responsible), Orion Ultraview 8x42, which had an even wider field at '8.2 degrees', and Meostar 8x32 (most recently by Troubador) although neither of the latter seemed quite as colourful as Pentax ED 8x32 and Kenko II.
Of course I had also been sorely tempted by the Opticron HRWP which you have, if it is the same as FrankD reviewed
https://www.birdforum.net/showthread.php?t=214018 except for the Field of 112m at 1000m - so that was one of the few not realized. However the Orion was the sharpest, among the biggest sweet spots, and widest FoV of the porros I have owned except for the Nikon SE 8x32, and 10x35. Evidently the SEs are recognised as benchmarks and by pure luck in those days I once had them together before getting anything else but don't miss them at all because I found them both too difficult to use, partly because of Eye Relief and roll down rubber eyepiece covers.
Amongst several porros tried, I did not find Pentax SP 10x50 WP sharp or bright enough but guess that after all you might just be tempted again by the Orion 8x42 because of its wide FoV, and sharpness which you might find equivalent to the HRWP.
(- or perhaps by the Orion Ultraview 10x50 available at £132.99. I have not tried that version but at 10x magnification it may have a similar AoV, while the image could be usefully bigger than that provided by the HRWP:
https://www.amazon.co.uk/Orion-09351-UltraView-Wide-Angle-Binoculars/dp/B0000XMRBM )...?