Well, you apparently chose one of those algorithms where you can order ASICs already. Simply typing "x11 asic" into google returns a lot of results and reviews even.
This is pretty much what I have warned you about, smaller miners will get easily overtaken by a few ASICs. As soon as your coin gets a noticable value, people will send their ASICs to mine it and smaller miners will just drop the coin.
This works against the decentralization aspect of blockchains.

Considering the low reward for the first blocks: Absolutely right choice. This may slow development in the first few days, but this gives people enough time to adapt and there is no need to be one of the first to get something out of mining.

So far I really lack a clear idea of how you want to implement those bets.
Is there any automated way of retrieving and analyzing game scores? I know that with Steam you can get some API access and get results. Is there anything similar for other big FPS games?
Doing this by hand is probably hardly worth the effort unless the referees get a compensation. This opens uip another box of problems though.

Maybe you can clarify your approach a bit more?
Are the people betting players themselves or are we just betting on professional matches?