Mine has been having a flaring problem also. It also will do a stacked shift, where 3rd-4th comes immediately after 2nd-3rd. The wierd thing is sometimes it will shift fine. I did turn the bowden cable clockwise, and turned the adjuster on the transmission modual clockwise, and that seemed to help temporarily, but after a 1,000 mile drive it's back to horrible flaring again. Mine also has the green vacuum restrictor. There is supposed to be a way to adjust shift quality by loosening the two bolts that hold the vcv on, then twisting it around, but I tried twisting it both ways and it only made things worse. The same went for adjusting the nut on the amplifier. I am kind of wondering if either the vcv or the modulator is bad on mine, but not sure how to test that?

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87 300D - Running on Veggie oil; 260,000 plus miles; Original #14 head