Until recently I had the same problem.... still do sometimes. Important thing to make sure that you are using footware made for that specific figure IE: V3, M3, SP3, V2 etc. Once the footware is in the scene, conform it. Then if necessary, I go to the parameter dials to make the shoes longer by adjusting one of the axis...I think it's the Z scale axis. Also, sometimes the height of the shoe too, I think that's the Y scale axis dial. Lastly, if needed, if the shoes are closed toe, I make the figure's toes invisible. Usually this works, if not, then I try a differnt shoe, or leave the figure barefoot.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi