Oversized Weapon (Ash Giant) too limited
Load sources described. Create new character. Create Monster. Apply kit "Giant (Ash) Default".
Notice feats list is empty.
Notice Huge Club (default with kit even) is applying a -2 per attack penalty. PCGen calculates +18/+13. PRD has +20/+15. Power says "without penalty". Adding and equipping other huge weapons maintain the penalty. Moving to a size large weapon makes the penalty go away.
Sources: Pathfinder RPG Core Supplements, Inner Sea World Guide, Rise of the Runelords Adventure Path, Rise of the Runelords Player's Guide.
Windows 8.1, Java 8 U 144