Hello,
about Chiller and A-Rad.
I guess you both already closed any downloading program or other stuff that could eat up some bandwidth.
After, if you're from 2 continents very far from each other (example: South America & Australia), I'm afraid there's not much you could do.
If you're from 2 continents a bit from each other (example: South America & Europe), then there are probably some better hours than other. If you know when your ping has better chance to be good (ie: in off-peak time, when not much people use internet in your country), then try to see if you can both play at this time to give 1 more try...