Hi again!
A few comments:
Beds: didn't mean to scare you about the 'bed race'! I've only experienced this a handful of times over many walks on the Norte, although people do complain that the infrastructure isn't as good as the Frances, and the simple fact is there's sometimes only one albergue, so you might want to have a back-up plan on these stages, just in case. But come to think of it, I've never had to sleep outside on the Norte (although I've budgeted a bit extra to avoid this). On quite a few occasions I've shared a double or triple hotel room with other pilgrims, often for the same price or less than an albergue. Whatever happens, you'll be ok.
Road walking: basically, along most of the Norte there are wonderful coastal paths, but for some reason the "official" camino goes along the road. My advice is not to worry too much about this being the "official" path - basically, the town councils try and find the paths of least resistance from A to B, and it doesn't always have anything to do with the historical Camino. So just try and take the coastal alternatives when you can (and sometimes you might actually prefer the road, as they tend to be more direct). You'll see that they've built a massive highway (the famous "A-8") across the north of Spain, so this has made the 'old' local roads very quiet. These are the roads they send the pilgrims on, and sometimes you won't see a car all day, and they go through pretty parts of the countryside. But the asphalt can be very hard on your joints, I've seen pilgrims almost crippled from the constant pounding over long distances. So definitely choose the "softer" paths when you can. Forum member Laurie has done an amazing job listing all the coastal alternatives:
https://www.caminodesantiago.me/community/threads/coastal-alternatives-to-the-nortes-asphalt.49578/
Other pilgrims: you'll definitely meet fellow pilgrims in June!! Even though it's less busy than the Frances, the albergues will be full of fellow pilgrims every night, so it's just a case of meeting people you like and walking together the next day... Also, although quieter than the Frances, you'll be walking through and between busy touristy cities and seaside resorts, so there's always a sense of life and activity.
You're going to have the time of your life!!