I just went to Trumper's (admittedly without the razor). I think the main thing that struck me is that the salesman obviously used a straight razor himself and agreed with me that the razor may have needed some honing. He also suggested that I apply a fine strop paste to the canvas side of my strop which I've just done and the blade does now seem to be a lot sharper (although I haven't tried shaving with it yet). I'd left the canvas side clean before.
I'll hone it for you PM me for details.