I've seen a lot of threads about HOW to rig racing or "geezer" but curious about the WHY? Geezer clearly gives you more space to duck under the boom but what are you losing? Speed, I assume, but how? Essentially, my question is two parts: 'what are the effects and trade offs of moving the gooseneck fore and aft?' and 'what are the effects and trade offs of tying the halyard higher and lower on the spar?'