The razor should definately have been sharp enough, it was honed by John Crowley before I received it and then sent it on to you. I tested it on my arm hair and it was certainly as sharp as it needs to be. It's possible you rolled the edge a little in stropping it, though you may find it was just nerves and not yet having the right feel for a straight. It does take time to get used to holding the blade right, and using the right pressure and angle.

I had a straight shaving lesson at Trumpers in London, but to be honest they didn't show me anything that wasn't explained perfectly on Lynn's DVD. Maybe wait for that to arrive and watch it a couple of times?

Also I found it easiest to shave a very light beard growth to start with, so maybe try the first pass with the grain using your Mach3, then re-lathering and doing a second pass with the straight. You should find it pulls a lot less and you can use a little less pressure, just while you start to get used to it.