So i'm trying to figure out my gear for a Grandfather berserk barbarian build i'm playing around with. I'm really struggling to understand the GWSC's numbers it's giving me. I thought for berserk, only the main hand weapon matters.. but depending on the "left weapon slot" setting and the offhand weapon, i'm getting different numbers. Here's 4 comparisons with the same weapons, all with different results, the strangest being the Falchion off-hand which is a base speed  which i'd expect to be the slowest combination, but ended up the fastest: Colossus Blade (shael'd) in primary (and "left weapon slot" selected) with a Crystal sword offhand vs. Same with a Falchion offhand: Next is Colossus Blade (shael'd) in primary with Crystal Sword offhand (with "left weapon slot" selected) vs. the same w/ Falchion in offhand: Can someone please help me understand these numbers? Reading on the FAQ, it sounds like "left weapon slot" is just a goofy thing when switching weapons and order of weapons equipped... but i don't understand how it's coming up w/ these results, especially with such huge differences. If any kind soul could explain and possibly an ELI5 or a formula for doing IAS calcs myself, that'd be great lol.