You might just try casting on fewer sts for the cuff/leg, then add them back after you've finished that part by increasing evenly around the entire sock. For example, instead of casting on 60 sts, I would try casting on 54. When I finished the cuff/leg, I would increase 6 sts evenly around the ankle to bring the st count back to 60. And if I were dealing with MUCH bigger feet in relation to the leg, I might even add MORE sts!
Or you might try a sock calculator which you can find on line. A sock calculator will use your st gauge and various measurements, such as width around the calf, width around the foot, etc. to estimate how many sts you need to work with for each section. Then you can increase/decrease to whatever st count suggested by the calculator.