Overclocking Jetson Nano's CPU and GPU

I need more information please. The maximum clock speed isn’t 1.5GHz. it’s 2.0 on the tegra x1, same cpu. So what makes 1.5 the max clock speed here? And why could I not create a custom kernel to increase cpu? It doesn’t seem the cores are at max clock speed or max power, and 1.5ghz is a bit on the light side, more would help tremendously. I understand this is going outside the scope of general support, but I’d like a detailed answer as to why this is not possible? Asus said this about their tinkerboard, and I got it up from 1.8 to 2.1 without instability. That being said I’m familiar with the process of needing to determine max power provided to cpu vs max allowable and working out the math to add the additional clock speeds inside that power range. The only thing I can think is the gpu is powerful and required a downclock to the cpu. But can I not resolve that by downclocking the gpu instead of the cpu?