I have 3.31s from the factory and do not have this issue, above 100km/hr I always shift to 6th. I usually drive around 120km/h though and have no problems passing. Minimal sacrifice to fuel economy too, I'm average 10L/100km mainly city. No complaints.
2011 V6 6MT, Kona Blue
, heated Saddle leather
***Procharged*** Mods: AIRAID CAI, Bama, Magnaflow Street CB, BBK S. Headers, BBK Catted X-Pipe, BBK 73TB, Strut Tower Brace, SR Springs 1.5, Koni STR.T Shocks/Struts, Bumpsteer Kit, Panhard Bar, LCAs, PowerStop Brake Kit, Black MGP Caliper Covers, GT500 Rear Diffuser, Roush Side Splitters, Stillen Front Chin, 30% Tint, LEDs, Black Super Snake Stripes, Polk/Alpine, Audio Control LC7i, RF 10" Sub, 19" Staggered AMRs