I think that the original question should be reframed a little bit. Hope you done mind Aron. When I see a question like this I automatically think "What is the most forgiving fixed blade broadhead?" The reason I think this way is that given a proper tune and consistent shooting technique, nearly every broadhead on the market will fly excellently. A couple things need to be looked at here length of the head and surface area of the blades. Longer heads, like a thunderhead for example, will effect the FOC of the arrow from the field point and may group well, but not fly with the field point. Likewise, the greater surface area of the blade, the more critical the tune becomes. Each of these can be overcome with some diligent and careful tuning. While thunderheads are a very good broadhead for the money, roughly one out of each six pack will not be machined straight. In nearly 9 years managing a proshop, I have found this to be true 99% of the time. So I tell the customers to spend a little extra and buy two three packs of a quality head and have 6 shootable heads rather than losing 1 out of the 6 they bought of thunderheads. Most companies have gone to shorter heads with less surface area on the blades to accommodate these factors I mentioned. Wac'em, Slick Trick, Montec, Shuttle T, etc. . . nearly all have these characteristics and fly exceptionally well and are fairly forgiving. Last year, I chose to do some testing with out top six heads (based on sales) in the shop. I tested the Slick trick 100gr standard, Montec 100gr, Viper trick 100gr, Shuttle T 100gr, Slick trick 100gr mag, and the Toxic 100gr. I tested these solely on the popularity in out store, not because of my own ratings. From a durability standpoint the Slick trick stuff maintained shape and blade sharpness much better than the rest. From an accuracy standpoint, I put one head on one arrow and shot each. From 40-80 yards all of the heads except for the toxics shot in the same group and hit in the same point as my field points impacted. Toxics consistently hit high and to the right. I tried to tune the toxics into the group with the others but could never get them to shoot with the others. I suspect that this was a result of arrow spine as the arrows were border line weak. So from a forgiving standpoint, this head was ruled out. Customers often have us help them tune there broadheads to shoot with their field points. Anecdotal evidence tells me that we spend more time doing this with Montecs and shuttle Ts than we do with the Slick Trick products. However, this time is minimal and usually very quick adjustments to the bows or to the shooters. From my experience, all quality broadheads are consistently accurate, but ST stuff seems to be the most forgiving. Some heads that I plan to text and will report on this year are the new Trophy Taker A-tac head, the exodus head, and the Solid Broadhead. Hope this helps and sorry for being so long winded.
John