On the free bit delivery system, we are beginning to understand that we have to increase the delivery quantity and do it periodically. We are studying the model so as not to overload the level of "delivered bits" above the possible return.
You don't need to give more BTC. The point of a faucet on a gambling site is so that new players can try the game before depositing. I think 5 bits when you register is enough, or you could do something like giving people 2 bits for free every X minutes for filling out a captcha. If you give an amount too high you'll have people abusing the faucet, which you don't want. Some sites like bustabit don't even have a faucet.