Yo

i had same issue's and only way to fix is to go to an exhaust place
get them to heat the exhaust pipe and shift it over a bit all fixed
and since then ive fixed 2 of my mates cars same prob
now we just lol about the stupid things
cos we all thought that it was us or dud cheap part
oh and i even emailed the complaints dept at the factory
and they also told me same thing heat n bend exhaust ..lol email came back 1 week after i worked it out

the problem is that to shorten the shift pattern you must make the bottom half longer on the stick