You can try using Kaufman's adaptive average (KAMA).
Usually, it's based on a 10 day period, but can be adapted a bit.
MIDDLE:=(HIGH+LOW+CLOSE)/3;
SPD :=REF (MIDDLE, 1)-REF (MIDDLE, 10);
VLT :=REF(SUM (ABS (CLOSE- REF ( CLOSE,1 )),10),1);
EFF :=ABS ( SPD / VLT );
FASTC:=2/5;
SLOWC:=2/21...