I ordered one of these and I modified it in the same way, tennis wrap and 90' the spine. I was super hyped, and I took it camping with the gf...it chops like no other knife I've ever had, almost as well as a hatchet, but I hate that handle so goddamn much. The back portion of the handle where the lanyard hole is, it's just exposed metal. It made my hand so sore when I did the loose chopping motion that maximizes the swing. I had paracord doubled up in that area, and tried to fill it...but it just sucks in that one spot. I also found the edge retention fantastic, like you, but I'm not a huge fan of the choil.
Different strokes for different folks, my gf loved the blade and it's now hers. All the better for it in my opinion. If the handle was redesigned I would say it was perhaps the best chopper on the market. I got it as a one knife option, or a knife I would take into a survival situation. I prefer my Condor Hudsons Bay for that, personally. Did that area of the handle give you any troubles?