400ex...Help!

[dnj400ex]

I have a 2002 400ex. Has WB Eseries exhaust, K&N filter, Stock pilot and needle, and 155 main. White brothers reccomended the 170 but that was too rich and it was noticably slower on top end. I then put the 155 in and it seems to run smooth and has its original speed back but I have ridden other 400's with similar setups and they seem much faster. If anyone can give me some advice on where to start I would appreciate it. I don't really care about top speed because I ride on technical trails, rocks, mud, etc. I just feel like it should perform a lot better out of the hole.
Thanks

[trailburner]

If you don't care about the top speed drop down one tooth on the front sprocket.....then you will have your low end that you want.
ps: your jetting sounds good to me.

[cals400ex]

your gearing and tire weights and sizes can make a nice difference. also, make sure you don't have too much play in the throttle cable. if you have 1/4 inch or more, thats too much. tighten it down some. this will make a difference in power too.

[mustang93]

how many discs are you running on the WB slip on, with the 155 main you should be around 12