I trade YM gaps. I try to put together a recipe of why gaps should fade or not. I look at longer time frames to check on trends, then to a 30 min charts to see if anything technical is developing, volume. I watch for exhaustion and break away gaps especially close. I find they give free trading options to gain entry & exit. I find all gaps fade eventually. Some quicker than others. I think short stops makes trying to fill these gaps unprofitable.