Low GPU Usage Iris + DH, AMD RX 7900XT

Hello! I have been trying out Iris with Distant Horizons, I am very impressed so far, but ever since I tried to download the latest version of Iris (From the Iris Website) GPU Usage seems to hang around 60% when shaders are enabled.
This is interesting to me because I have a different version of Iris with DH Support that shows way better GPU Utilization, this Iris version is: "iris-mc1.20.4-1.7-alpha.1-ba8b16d4.jar", it seems to work way better compared to the latest one in the Iris Website and the latest test build. in the #unstable-releases channel.
Is this Alpha Version newer and I'm just confused or is there something wrong with the version from the Iris Website?
I have included a video comparing the 2 versions.
Iris "iris-1.7.0-snapshot+mc1.20.4-5983468.jar" shows exactly the same GPU usage behavior as "1.7.0-snapshot+mc1.20.4-7fcec4d".
I have tried installing other optimization mods to try and improve performance, while these mods do improve performance a bit, they don't improve it enough.
I have also tried messing with the shaderpack settings, but that doesn't help either.
Sorry in advance if I just got different versions confused and this is actually expected behavior.
Here's a list of my PC specs:
CPU: Ryzen 7 5800X
GPU: AMD Radeon RX 7900XT
RAM: 16GB DDR4@3600Mhz CL18
OS: Windows 11
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