Hardfork 20 - Trying out the Mana

This is our First Post after Hardfork 20. Hello World.

Here is the RC Manabar from steemd.com
Current Mana: 1,405,386,958,449
Max Mana: 5,911,859,964,910
Estimated Mana (whatever it is): 1,451,751,267,618

And this is after updating this post, which should be equivalent to creating a new post
Current Mana: 1,439,898,847,762
Max Mana: 5,911,859,964,910
Estimated Mana : 1,440,227,284,426

Current Mana had actually increased by 34billion. Estimated Mana decreased by 11billion. Making no sense to me.

Here is after making an upvote. Not much changes.

Everyone is saying RC is a good thing that aims to clamp out the spammers and abusers. Every action on the blockchain will consume RC. But based on the experiment I did, I still could not tell how it works.