Got this plant as a seedling in late 2007 and has flowered many times! About 5 years ago, I pruned the roots to fit in a smaller pot and it resented the repotting process.
Got it to flower last year and now it is in flower again.
Maybe with a Stereo Zoom microscope that can view up to 40x and using something like this on this site: In the lab: Bausch and Lomb StereoZoom 4 with Phone Adapter | Details | Hackaday.io
I got myself a stereo zoom to view pest but have not gotten a Phone adapter yet!
The media is too dry for Paphiopedilum as they need constant moisture in the media. Looks like the media you are using is more suited to epiphytes that need to dry out really quickly. I would use a smaller grade of bark and add sphagnum moss to the mix. Make sure you have at least 50% or more...