Thanx to QUAVION SKYNET CORNISH JACK
My apologies for the lack of clarity of my submit.The low speed red barber pole and attendant yellow caution range is sitting too high up on the airspeed tape.eg on departure with the flap up tick postnd. at 255 kts the very top of the yellow is sitting at 255 kts with the a/c clean.On landing ,vref30 135 kts,the very top of the yellow is sitting at 135 kts.
For QUAVION our selected margin on the FMSCDU PERF page is 1.3g.