here's a pic of what presumably is a standard 5.5
make sure your jib block runners are in the same position
http://www.thebeachcats.com/classifieds/showfull.php?product=11728&bigimage=DSC00406.jpgthe 5.5 is very very similar to the 5.2 and on the 5.2 the best jib sheeting position for pointing is on the tramp about 30cm in from the runners...
as jake says you need 2 sets of tell-tales to determine the correct fore-aft position, which is when they are both breaking at the same time
better pointing is slower, but it if you need to tack often, you get upwind faster
footing off a little is faster but you'll only get upwind quicker if you don't have to tack much...
it's a complex equation answered more by your own situation than how other people setup their boats for other places...
edit: if the jib is not from a 5.5 all bets are off, apart from the difference in cut and curvature do you know how the lengths of the 3 sides compare to that of the factory sail?
