The estimated total sieving time looks like it isn't being printed correctly, but other than that it all looks fine and the best poly was chosen. Note that this number isn't 5 digits larger, it is 10 digits larger than your previous one. Unless there are algebraic factors that can be pulled out, SNFS difficulty is proportional to the full input size, not the cofactor size. That's why it is sometimes better to run GNFS on SNFSable numbers.
