Thank you guys for brainstorming optimal miner settings. This is not really my area of expertise but sharing your experiences will help you all to setup your miners the best way.
Neither your "hash rate" or my rejects seems to exactly match cgminer's output (consistently shows > 1.7Mh yet you show my 24hr average at 1.5Mh/s).
Please remember that 24h average takes summary data from the last 24 hours and divides by 24. So if haven't been mining the full 24 hours, it will show less. For example if you have 2 MH/s and you've been mining for 12 hours, the 24 hour average will show 1 MH/s as it's 12h*2MHs + 12h*0MHs = 1MH/s average.
On your user page you have a 24-hour hashrate chart (you need to switch the tab to it) and you can check the data from there.
Regarding doge: at its current difficulty I'd like to have at least 2 GH/s and preferably 4 GH/s to start mining it.