Hi ctual.
i. Sore eyes are usually caused by UV, your 2" didymium filter is too small - not protecting both eyes from seeing the flame. I use a clip-on filter (on my specticals) designed for both sodium flare & UV light (a 'pure' didymium filter removes sodium flare & little UV)
2. I agree with Kathy, but I think excessive carbon build up comes from dirty gas, if you are using bottled propane, try another supplier.
Peter
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