Try going down one main jet size, to like a 155. Should help out.

 

Another thing you may want to try is switching to a Champion N3C plug. The NGKs never ran good in my R. I've never had any problems with the Champions and they last for months. Most of the time I just change the plug when it doesn't need to be changed. The Champions are also a lot cheaper and easier to find since most auto parts stores carry them.