Yep! Your Honchkrow will critically hit every time it attacks. However, your calculations are wrong.
When a move/item/ability increases critical hit ratio, it actually is increasing it by stages, not fractions. For example, a move with a high critical hit ratio (Stone Edge, Night Slash) increases the chance by one stage. Each of these stages have different chances to critically hit, and they can be found here. I explain this more elaborately here.
Source: Above Links & Experience