i then used a very sharp chisel to try and remove this wax and i roughened the surface of the metal
This is pretty bad. The Verdier is designed for the platter to dominate the motor, not the other way round. You really should fix the platter.
If you use 2000 grit wet and dry sandpaper you can gently sand the platter rim - what you do is smear some light oil over the rim to reduce the aggression of the sandpaper , and then gently spin the platter hold the 2000 grit wet and dry sand paper ( wetted ). This should take off any roughness while removing minimal metal. That Process is more gentle than most metal polishes.
With regard to Linen vs silk - after reading earlier posts I did some research on the merits. I was surprised to find the linen has less elasticity than silk, but linen is woven flax which is more course than silk which is softer. This might explain you preference for the silk. Note here that Verdier suggest very low tension with the Linen, silk you can run higher tension with less noise issues. The designer of my TT suggested chalked silk, which may be he intended a low level of tension, similar to the Verdier, hence the chalk to add a little grip.
Linen thread has wax in it and I'm pretty sure the Verdier linen thread is a low wax linen. Ideally you would want no wax.
Cleaning the platter -
I use heavy duty degreaser CRC Electroclean to degrease the rim, using a microfibres cloth, and then use electrical contact cleaner CRC CO to remove any residue from the degreaser. This works extremely well, and I have found that the platter stays cleaner and shiny much longer than with polishes.
I found the surgical silk leaves no residue.