sub 400 yayyy
I don't think it's possible to make a cheaper and better sum solve. Maybe one could trim one or two rails but that's it.

A better sum is surely possible aiming for 18R (30R here with minimum 26 required), but I'll let it to more experienced people. Surely one could save 50+ cycles, and 50g is a lot of flexibility.

I liked this puzzle ! Going for sum blindly is a very dark path though, hope I did well but I have no idea