That is right, sometimes Rfinder sends you out on a silly long route. This is especially so over the oceans. However, if you roll back to an earlier cycle, such as 0904, you will get a more sensible 2350 NM from Seatlle to Honolulu. I have no idea why this is so, but this is what I do.
Travelling from Europe to North America you should enable NAT - North Atlantic Tracks. I sometimes forget that, and it suggests a route around the North Pole and Canada..

Best Regards
Anders