I wouldn't sweat that test, I do it once in a while. You have the TNT which I do and is, for me, a great indicator, and the HHT which is also great. If you can slice a little hanging hair, your razor is good to go....Go Gators!
Another tip from Randydance, once the edge passes the TNT do not continue to use it. The TNT can dull an edge that passes TPT.