I was to focused on my questions but missed all the background. Ok here goes.
1) Shifts above about 60 % throttle shifts are fine. This tells me that there should be enough pressure in the system to handle all other shifts.
2) Light throttle shifts below about 25 % throttle are also fine.
3) Medium throttle shifts between about 25 - 60 % throttle flares. This is more pronounced when the car is cold and has been standing for a couple of hours.
4) I have 18 inches of vacum at idle when I measure at the green modulator the vacum holds steadily and drops to almost 0 when a I step on the throttle.
I have done several adjustments lately.
-I put a little bit of slack into the bowden cable to get the shift points at lower speed (the shift pattern was a bit to sporty for my taste). The shift points are now fine. This adjustment did nothing to the flaring shifts (both 2-3 and 3-4).
- I replaced the short rubber hose between the metallic vacum line and the modulator.
- I have in total, and in steps of 4 -5 clicks, adjusted the T-handle CW about 20 clicks but this has only reduced the flaring somewhat. As I wrote before I drove the car for a day or two after each adjustment.
I have also read many many postings regarding the modulator and the general concensus seems to be that if the WOT shift don´t flare adjusting the modulator should do the trick. On the other hand many posts describes how sensitive the adjustment is and now that I have adjusted about 20 clicks or about 3 full turns I´m getting nervous that I might screw something up.
At the moment I plan to take the car out and drive until warm then I will disconnect the vacum hose to the modulator by which i expect that most shifts will be rough. This I assumes will show if the modulator works or not.
Any ideas what I´m up against?
Many thanks/ Mikael