I did just try the new LPF feature, and it doesn’t seem to help at all with my SNES. Just gives me bright edges instead (as someone else has already reported). Guess it only works on less blurrier models…
Can you post a closeup picture of the bright edges that you see? It might be fixable. Did you try it on every lineX mode?
What kind of RGB cable are you using? Composite video sync, luma or sync stripper?
The cheapest way to find a 1-CHIP would be by looking at the serial numbers. I found a cheap PAL 1-CHIP-02 that way. Here is a list of serial numbers: https://docs.google.com/spreadsheets/d/1HYLy_TTDop_FzuX6qnxuQI43upg4raXfno582taO744/pubhtml