Regarding recommended settings for MongoDB, you might find the Production Notes contain all the recommendations. And yes, THP is recommended to not be used as per the Production Notes and the related Disable Transparent Huge Pages (THP) page.
Regarding your question:
how do i ensure all the pods utilize max cpu and its memory assigned so that then the IO reaches the disk
I think you can achieve this basically by ensuring that your workload exceeds the hardware’s capability, e.g. maybe you can try to do a collection scan on a collection that’s way larger than your provisioned RAM? Apologies for the lack of ideas, but your question is basically how to do what we tell people not to do so it’s a bit of an unfamiliar territory 
Best regards
Kevin