The "Big" guys at my gym tell me that in order to get good mass on your traps you have to do slow strict reps. I use 150 lb dumbells for shrugs in "good" not great form(after 8 reps i usually cant go all the way up) they are telling me thats way too much. I tried goin lighter but it didnt feel as good. I also do 500lbs on the smith machine (shrugs) for about 6 reps (pyramid). Am i doing this wrong?