Dust boot soft bristle strip recommendation

The bristle strips I installed about 9 months ago are causing damage because they are too stiff, can anyone recommend a source/brand/type of bristles?

I took the Makita router base, and modified it so that it would hold the dust boot, and which serves me very well, It rides on the router which means the bit never hits it.
But the stiffness of the bristles is giving problems.
My design needs the bristles set in a metal strip. Are silicon bristles softer?.

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For my previous machine, I home-brewed a dust boot using this stuff:


It worked very well for me.

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