I started POS mining a week ago and bought 13 tickets at the price of 25 dcr(I know it wasn't the best price, but still I wanted to start). I did this by using dcrticketbuyer and automating the process. I have a few questions about efficiency: Should I change the fee, and if I increase it will it be mined faster. If so, what is a good fee price? And am I supposed to/would it be more efficient if I changed the expiration date?