Mines a Classic Glaas factory build and yes I have the same problem. Just fitted new spax coil overs front and back. Yes front right hand jacked up and left hand side down. The problem is in the body. Its not symmetrical. Running yokohama 235/55 front it rubs, run toyo 235/50 no rub. Back yokohama 275/50 no rub, toyo 295/60 rubs only on the right under load. Has nothing to do with suspension set up, just stand at the front and look you'll see the body is off set to the left approx 10mm.
The only time I get rubbing is when load is on the front, ie dips in road surface or ridges. Just have to be aware of road conditions which sometimes takes the fun out of driving.
Considering minor guard mods or waiting until tyres wear down then replacing front with 215/55 yokos.