Need a suggestion:

I have the below servers to mine [CPU only]

1. 4 processors Intel [dual core]
2. 8 processors Intel [quad core]
3. 8 processors Intel [quad core]
4. 8 processors Intel [quad core]
5. 8 processors Intel [quad core]

All the above processors are - Intel® Xeon® Platinum 8168 processor, featuring a base core frequency of 2.7 GHz and a maximum single-core turbo frequency of 3.7 GHz

I am currently mining for VRM in a pool & earning 1 VRM a day max & also the Hash rates on above CPUs vary time to time.

Please suggest if there are any better mining suggestions with the above set?

miner software - https://github.com/pooler/cpuminer

Thank you.