Do you recommend using miners at higher frequencies, or do you consider this too risky for miner's lifespan?

Impact of Overclocking/Underclocking on Hashrate and Power Ratio

For M63, M64, and M65 series hydro-cooling miners, What is the maximum power they can achieve after overclocking?

I am currently trying to increase the hashrate to the highest rate and disregarding power usage. How do I go about doing this?

What are two most important indicators for a miner?