DxM and synthetic canniboids

anyone ever mix these?if so how much dex and what kind of smoke? 7H is my favorite synthetic,and dex my favorite period. back when weed was an option it would potentate my trip and make a party in my mind lol. well smoking synthetics obviously offers a range of highs somewhat similar to weed but more intense. well ive found smoking a few hits of some 7h will leave me trippin over my own balls,where i had to smoke weed all day to get anywhere near that level.i'm not confused as why this is,7h gets me alot more loaded,alot quicker than weed when im sober much less on dex. im just interested in other peoples stories