Fork spring rebuild queries

After stripping down my series 3 TV forks, I intend to replace all of the spring assembly etc. The rubber buffers are bolt-in, the lower buffers are bigger than the upper but both are considerably flattened. I note that some suppliers are asking if the forks are for disc brakes, if so, then different sizes are suggested, i.e. 20mm - does this include the steel mounting bracket bonded to the rubber? Also. are uprated springs worth the effort and which way round are they fitted, narrow pitch coil up or down? Still looking for a reputable spring compressor, the last model I tried nearly wrecked the casing!
Any help would be gratefully received.
