You can not increase the total amount of P and not decrease the value o f each P. Not with a fixed reward pool.
You aren't increasing the total amount of P because the voting power decreases accordingly with a higher-powered vote in the new system. Therefore, subsequent votes would be worth less due to significantly reduced voting power.
Yes, once again. I get it. Its just like the current system except you can cast 8X power votes. Thats an awesome idea that exists only in your head and is not documented anywhere except in a never past bed time land. This is where your vote is worth 8X
@sigmajin already knows this, but this is the code, which you can see has now been merged into master: https://github.com/steemit/steem/commit/6500bb65eb6282866f3c6f356cbcbe09fd03c7bf