Forcing very short diameter turns works - using your poles more makes it easier to force those little turns.
Another way to handle narrow paths is to simply straightline until speed picks up a bit then snap both skis 180 to the path while keeping your shoulders facing straight down the path, roll onto your uphill edges so as not to catch an edge - skid with your skis at right angles to the path with shoulders facing directly down the path then snap the skis back to normal when you have washed off enough speed - repeat as required. A bit like a rolling hockey stop I guess.
If you don't have the ability to do either of these techniques swallow your pride and bust out the trusty old snowplough? Wanna mix it up? Switch snowplough?