I think I found out why my dcs always was blinking on top end also. 3 Yamaha shops put the biggest jet on MAG side instead of PTO. The third one corrected it, when I told him. I also got the needle position corrected, to actual 3.5. No more midrange blinking here! In fact, I sat the tempaflow on "lean" position, and it would still not blink anywhere in the range. I wonder if the tempaflow actually adjusts itself or does it only respond to screw setting changes.