In the current (errata 4.0) version of Campaign Operations (p.73) the Cluster Hitter SPA says:
The warrior who has the Cluster Hitter Ability has spent hours mastering the focus of clustering weapons such as missile and rocket launchers, ultra and rotary autocannons, and LB-X style weapons. Able to more tightly group his shots, the Cluster Hitter can make an Aimed Attack with any one of his unit’s cluster-type weapons using all of the rules for the Marksman SPA (see p. 77). On a successful hit, this focused attack will deliver all of the shot’s clustered rounds to the targeted location. When not attempting this focused attack, the Cluster Hitter receives a +1 roll modifier on the Cluster Hits Table for all applicable weapons. The Cluster Hitter SPA cannot be used in conjunction with the Oblique Attacker SPA (see p. 78), or the Sandblaster SPA (see p. 79).
1. Does this bypass the need to roll cluster hits and do 100% of possible damage to the designated location?
2. How does this interact with missiles vs. AMS equipped targets?
3. When targeting flying units with LB-x weapons, does the flak modifier apply?
