Does anyone know if it's a problem pointing my solo mining stratum server (sammy007) to a public node? I'm running some pretty big hashrate...
I don't think the stratum server will bring any significant load to the public node, because the stratum only needs to fetch a block template every time the public node receives a new block from the network (which happens every 4 minutes on average). The load for processing lots of shares your miners produce will be put on the stratum server which you run at your own cost.