I switched from 19" Bridgestone RFTs to Falkens, just as you have.
My tyres were similarly badly worn on the edges. I had a full Hunter alignment done at the time as the tyre place (Micheldever - so a well respected place) were convinced the alignment must be shot.
However, they tested it and it was all perfect. The new non-RFT have worn normally since then and are due for replacement soon. They have pretty even wear right across.
So I am sure the edge wear is a property of the RFT. The side walls are so incredibly stiff, I think the rest of the tyre must flex inwards during normal use and the sidewall stays pressed into the tarmac and this causes the wear.
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