Hi, Michael,
Lucky you, it's a wonderful walk.
Just a couple of thoughts.
Day 5. When you get to Berducedo, you will find there are several options, both private rooms, private Albergues, and municipal Albergue. Since your next day into Grandas is a short one, you might want to stop in Berducedo when you get there! (about 6??? before La Mesa -- and La Mesa is a tiny hamlet with not many services).
Day 8. A bunch of us knew we wanted to spend more time in Lugo the next day but couldn't take a rest day there, so when we got to Cadavo, we had a light lunch and a rest and then took on the next 8 km or so to Castroverde. It's got a lot of km through a shaded forest path and then a few km on untraveled roads. There is both an Albergue and pension there. That makes the next day into Lugo shorter, giving us more time there. Lugo has a lot to see, and sitting in the plaza is VERY enjoyable, great ambiente!
Day 10. I highly recommend the two private albergues in Ponte Ferreira, which is about 7 km further on from San Roman. One is new and minimalist, one is old and traditional, both serve meals and are spotless. That also means you can, if you want, continue on to Boente the next day. This may be appealing because the onslaught of pilgrims in Melide is likely to be a shock, and Boente is much smaller and has a nice private Albergue. Then the following day to ARca and then on to Santiago.
I would be very interested to hear about the numbers you encounter, I think the Primitivo has enjoyed a huge surge in popularity but by this time of the year, I bet it will be pretty calm. Buen camino! Laurie