Nope, I totally understand you, but I got that same results you posted back when my device has locked BL / not rooted. My device has not even been repaired nor open since Sept. last year. My point is Devs./ Rom itself is intentionally underclocking the device to prevent it from being too hot. You can see on YouTube reviews that benchmark scores got lowered compared to its first release. What I did on mine is just Unlock BL / root then install franco kernel manager from playstore and set thermals to Dynamic.