eagle cad: enlarging the pads
To have a minimum annular ring at pads, open your DRC in the PCB window, go to the RESTRING tab and set there the minimum for your pads in top, bottom (I guess you are not using inner layers). For my experience with DIY pcbs, a value over 12 mils works. 
Note: take care as this can create pad-to-pad clearance violations.