In 2001 our bikes had a long thin tapering needle, which according to my suspension tuner ( Steve Searcy @ clean racing) worked well with a straight rate spring, which I agree. The bike came with a rising rate spring.
So now they have gone to a short fat needle to give a big increase in damping right at the end of the stroke, which coincidentally works well with a rising rate spring. Again, I have to agree, my 2004 susupension works great.
I don't mean to insult 2005 fc550 in anyway shape or form by my next statement. Let me reapeat, 2005FC550 I do not intend to insult you or slight you in anyway.
You know what, I just wrote and deleted a full story of my experience with Race Tech from a year ago, along wth my opinion of Race Tech. But, decideded not to print it so as to not make anyone feel bad. So, I'll just say that it has been my experience that with the right tuning of the shim stack, and the right spring, the stock needle works just fine.
I hope 2005FC550 has the best of luck with the tapered needle.