Great song, the structure and riffs are awesome. Great vocals too.
If you are looking for more size can I ask are you double/quad tracking and how hard are you panning?
It sounds like there are more than one track but panned a bit central? I may be way off here.
I double track and pan hard right and left and either use slightly different amp setting or different IR's. Every time I dial in a rhythm tone I do a secondary tone with a different mid and high setting.
I find that two different tones make the overall guitars bigger in the mix. Sometimes I'll use two different amps for the same purpose.
Some parts I'll quad track just to add a dynamic lift in places.
I'm definitely no expert though, I'm sure there are plenty of people here who can offer and more technical approach.
The old drive block before the amp trick works with a lot of amps too.
What is your go to amp?
But it's all about personal preference and a lot of trial and error.
It took me a while to start to find how to get the tones I was looking for.
My suggestion is to go through the amps to find the ones in the ballpark of what you want, then find the cab IRs that work well with those amps.
Nice choice with Cab Pack 13. I was struggling to get a tone I was super happy with, then I bought that pack and it just worked for me. Once again, it's a personal preference.
Your tone is really good, go with your gut and try a few things until you find your way of sitting everything in the mix in a way that suits your ear. keep experimenting and you'll find what you're after.
Welcome to the Fractal community, you're going to love it.
Most importantly, have fun.