I frequently arrive at major airfields such as DBX,AMS,LHR etc. at a landing weight of approx. 300 tonnes, which if using Flaps 25, requires a Vref of 164kts (+5, =approach speed of 169 kts). I always inform ATC approach on 1st contact with my minimum speed to touchdown of 170 kts and have never had a problem. If you need a higher speed than 160 kts, why not inform ATC as early as possible, about your requirements? They're nice people, really!