The way a beginner knows if a razor is shaving sharp, is by buying it from someone he trusts enough to sell him a shaving sharp razor, and then exercising that trust by not trying to test the edge on anything except his face. That said, I've never dealt with the invisible edge, but I've only ever heard positive things from others who have. Doing your own sharpness tests speaks more to your own mistrust of your chosen vendor than it does the razors ability. Now you've done the tests, and believe the razor to be insufficient. Shaving with it will only further prove to your already decided mind that the razor isn't sharp. Find a vendor you trust, or send the razor to someone you have no doubt can sharpen a razor. Then when you get the razor back....Shave with it. It won't be easy...You're new. It's expected.

The best option would be to choose several different vendors, and have them each hone one razor for you. Once again, the sharpness tests are still beyond you. But having 4 different people who's livelihood is in no small part derived from their ability to complete the task, should ensure you several different examples of shaving sharp. If you want four names, I'll provide them through PM. Best regards,

Justin