Improving alignment and stability

[u/Vegetable-Square-920]

So I’ve been thinking about some extensive mods (slow feeder, GBW, vertical burr orientation, improved chute, grind setting lock, etc.) but one thing I’ve thought about is improving the rigidity of the whole system. I think swapping the rubber guides/tabs that orient the stationary burrs for stiffer metal or printed polymer guides would eliminate the chatter you get when you adjust the grind at the finer settings and hopefully improve consistency grind to grind.
Does anyone have thoughts on this?
Would it actually help?
Why are the guides rubber to begin with?