This is a question that really needs professional observation and advice to answer, but I thought I'd see what people think. Here's the issue: I hook/draw my driver consistently. I draw it about 35% of the time, with perfect ball flight, and it's a thing of beauty. About 55% of the time, it flat-out hooks bad. Goes about 150 yards straight as an arrow, then dives left. Other 10% of the time I duck hook it. I NEVER hook my irons, it is almost always dead straight or a slight draw.

Question: is this a case where a stiffer shaft might help, or is there probably something inherent in my swing?