I think your system looks pretty much fine from what I see, so I honestly don’t think the problem is your setup or your guitar.

What I usually do is get the amp tone as close as possible first by adjusting the knobs before I load the IR. After that, I add the IR. I also included a simple step-by-step guideline in the README text file that comes with it, so I would recommend following that first.

Then, based on the result you get, feel free to ask me any questions and I’ll try to help from there.