What do I need to re-adjust the needle on my Z?

Currently, I took the cap off of the snorkel, hacked the top off of the airbox (and put my own "outwears" cover on), cut out the pea shooter of the stock exhaust and rejet with a 140 main. I'm feeling a flat spot in the mid-range (then the Z just erupts with power. *vroooooooooooom*)

HELP!
I have about a week before my next big ride and I'm playin' catch up to a Raptor (mod airfilter) and 400ex (piped, jetted, airfilter, airbox, geared down).

 

I know you have been on here for a while and I have posted the answer to this question many times. You are going to have to work for this answer.

 

I did a search and you've only mentioned the spacer thing and once.
I was hoping there was a way to adjust more than by moving a spacer.

I was thinking along the lines of "this place sells needles like the dynojet kits have" or something else. I don't want to waste $60 on a dynojet kit when I just need an adjustable needle.

*sigh*

(update)
I used two #4 washers and put them under the plastic spacer. It seems alright for now.