Okay, when I first fitted my knocklink the car was practically standard, engine wise. I left the setting on maximum sensitivity, and saw such little activity I used to wonder if it was even working, or if I had it on minimum sensitivity!!!

After fitting headers / decat / remap, naturally I immediately saw a lot more 'noise', regularly at two lit LEDs. However, this has seemingly gotten worse, and I am currently seeing an awful lot of 'big red'.

Not so much in lower gears, or when caning it up through the box from lower gears, but mostly when going from cruise to WOT at 3 - 3500rpm in 4th and particularly 5th.

Something to worry about, or just need to adjust my sensitivity???

Check with the ECU mapper. Drive to avoid the big reds if they were not there during the mapping and you were told they were OK until you can speak to the mapper.

John, yup tis exactly what I'm doing / going to do. Any thoughts / comments / experience on sensitivity settings?

Even on max sensitivity should I be seeing reds????

Depends on the map and the individual car. Speak to the mapper.