If you really want to coin to be truly decentralized it should be a multi Algorithm(so that any hardware can mine the coin) with difficulty re-targeting ....harder difficulty for when the network gets busy... making it expensive and impracticable for corporate miners/farms to mine the coin
How can you make it "expensive and impractical" for miner A with 100 GPUs and "cheap and practical" for miner B with 1 GPU???
muliti algorithm coin..... you forgot about difficulty re targeting after each block found that i mentioned.
Example:
Miner A has a large amount of hashing power and points it to the coin network..... network recognizes increased hashing power so after the next block found network difficulty increase's and the time period for rewards increase's.
Miner A paying $1000 electricity is not getting much return and also because miner A is slowing the reward process... in theory this should increase the market value and could actually benefit miner B paying $100 for electricity
*any home miner should invest in making their own electricity before mining