Warren, i hate to rain on your parade, but the the majority of guys who really train tend to gain more muscle when lifting heavy than they do by lifting lighter. and it's deep, dense, thick muslce. now with that said, high rep ranges and higher volume does have it's place, just not in a "bulking" phase (IMO) unless it is being done in a deload week to take a break from heavy lifting so that the body can rest and recover from constantly handeling heavier loads.