I have Hunted Javys for a long time now..... I have tried a decoy once... With mixed results . First Group, freaked when they saw it , and scattered. Second Group, walked right by and never gave it a second look.... I have had better luck once I am into them to use a call, especially after I have one down... Literally, they go crazy and are running everywhere, darting back and forth across the sendero, running into my stool and daypack. It was wild...
As far as the decoy goes, give her a try... You may have better luck. Tu Compadres, Sutty