No wonder you get vibrations with those tyres lol......there a bit extreme for a Freelander. I've got 50mm lift, 30mm wheel spacers, camber bolts and 205/80/16 AT tyres. Been on for 2 years, and no problems (touch wood).
Did you fit longer brake hoses with the 50mm kit? Do you remember which kit/where you bought it from?
Tell it to this...Has had lift kit fitted for 40,000 miles with no probs, complete with bigger wheels and tyres has 4-5 inch more clearance than a standard freelander which is about 2" more than a standard 90/110 and plenty more than standard series
On a recent trip, I done 600+ miles....mixture of town, country roads & motorways, with an average of 40mpg.
Wheel and tyre choice depends how often your going to go off road.
40mph would be nice!! I can dream