There is no exact formula to fix all problems. If you are knitting toe up, you will be adding stitches in multiples of four to form the toe. Making the sock smaller: if four stitches are enough to resolve the issue, leave off one decrease row. If that adjustment is not enough, see if then going down one size on knitting needles works, if then too tight, knit the row you left off and the socks should fit. Try on the sock knitted toe up when you are trouble shooting. Keep track of what works for future reference. Changing any element such as the yarn, changes the formula a bit too.
If you go down on needle size, use a needle of the same material as when I switch from wood to metal on the same size needle, I knit tighter to adjust for the more slippery needles. I like bamboo needles but when making increases, needles with sharper tips work better when knitting on smaller needles.
Everyone's foot is unique and heel placement can make the sock or ruin it. When you don't know, try an after thought heel.