Jetting questions on stock KDX200

[DirtDaddy]

Bike: stock 2006 200, airbox lid removed. Started with 155 main and 45 p/j per recommendations from Freddette website. Airscrew at 1-3/4 turns out. Amsoil Interceptor at 40:1. Bike seems to run pretty well, but slight bog off idle and a bit of smoke and spooge coming out of the pipe. Finally got a chance and place to do a plug chop test last week at 2000' and 60 degrees. After a wide open run for 1/2 mile I couldn't see any color at the base of the insulator. Surprised me as I figured if anything I would be too rich. Tried a 160 with the same results and didn't seem to be as crisp with a bit more smoke.
Is 1/2 mile long enough for the test? Should the color be fairly evident?
Does 1-3/4 turns out sound OK on the airscrew as far as having the correct p/j? I plan on experimenting with the needle position next time I get a chance.
I am trying to follow all the advice in Inda's jetting write-up. Any comments or advice?

[Indawoods]

Try a 152/42 combo as a starting point...

160 is richer...

[DirtDaddy]

I know, that's why I was surprised that I couldn't see any color on the plug after the chop test. Should the 1/2 mile wide open run be sufficient to color the plug noticeably?

I'll give the 152/42 combo a try. Thanks.

[Indawoods]

The plug colors at the bottom of the insulator... you have to cut the metal jacket off around the insulator to see the colored ring.