Try fighting LUBU. Ultimately, I think you'll find that your results will be about the same as it would be against SpookIsland, except you'd have more losses. Does this have anything to do with the weapon?
In part, yes, but you're also discounting timing and ping. Spook has sub 30 ping, last I checked, and LUBU has sub-20 on most days. You've got...what...60-80?
I'm not blaming it on that, that's just one small factor amongst others. For instance, Spook has a tendency to left click faster than most while using his keyboard to avoid your hits, and LUBU combines that with his right clicks. There's dozens of factors in any given fight that lead to the results we see, and your weapon is just one of them.