My scary shake at over 85mph

Hi guys not sure if anyone can help as have so far replaced shocks all round new steering damper new swivel ball joints new bags new track rod new drag link new wheel bearings all round new prop UJ's new discs and pads oh and new bushes allround now the problem is drives really well no pulling but at 85 mph plus it shakes like buggery it has just started also noticed I can get it to do the shake if I turn left and brake really hard it starts in the steering column and then runs through the whole car Guess it is a resonance thing have tried a couple of sets of wheels and no difference.
Any Ideas????

Stay at 70 or below???

Good avice for UK but I do lots in Germany and france and at 70 it takes too long she sits or used to sit really solid at 90/95

You don't mention wheel balance? That would explain it if not within tolerance.