I have been doing sample speed tests for July, because like you, I had inconsistencies.
Latency seems to be constant at 55ms,
Download, on a 4 Meg line varies from 2272 kbps to 3305 kbps and average 3030 kbps - so essentially getting 75% of what I am paying for.
I will continue to monitor then chat to AH again at month end.
Same problem here...

