Mert - I put TBS needles with 2 shims in my carbs based upon some drunken advice at the GA Rally, and that has been a big improvement to the flat mid-range. I also have my snorks out, which was the first big improvement across the board (that and pipes). I have since gone to the 18t, which hasn't done much to the low end but has done a whole lot to highway cruising. The bike is totally different at 80mph with the 18t. I am very happy with the 18t regardless of any negatives on the low end.
I am waiting to see what Triumph does in the 2007 line (1500cc?) before I invest in the Big Bore. We'll see if I can wait that long!
p.s. I also modified my SS pipes to Triumphant's specifications and am very happy with the enhanced sound, especially when "on" the gas.
Ride Safe
Ryan