If you can increase the speed in auto betting, you will reach the goal much easier. 2 bets a second isn't bad, but the speed is much higher on some other sites.
this actually has been discussed before, and here is dadice statement of the speed of the roll, it is either depends on your bet amount and also wether if it is from faucet or deposit
The higher your bet is,the faster the roll. Try betting a bit more and see if the speed goes up.
It cannot be the same bet speed for a user that is just using the faucet and a user who is depositing his own money. Obviously Da Dice is a business and we have in the first instance to use server resources for users who deposited with us. I will find out with dev what kind of threshold is applied.