Marksman Building?

Of course people always say that it you want to boss sooner, then you have to have max SE asap, but I kinda doubt people would want a 13X in their bossing party to begin with unless they consider it a pure SE mule. This is the line of thinking that got me to choose my build. If you're fine with being a buff mule for several levels of "bossing" by all means go ahead, but I personally would prefer to be in the fray when it comes time for me to start participating in those fights. Also, who has the HP for anything better than Zakum at level 13X without washing/blooding?

You make it sound like there's a lot of bosses better than Zakum. Zakum and Pap are usually what people are referring to.