I have no suggestions and am pretty new at this but, will tell you my tale and you can soak it in..
I just started 2 package 2 months ago. I put them in a 10 frame deep, 1 frame half full of comb on the end in each box with no follower boards and until the last few days it looked like the pictures posted but further along.
Now there are 6 built out 3/4 the way across the frame or so and they are getting off line because they seem to be starting to make honey at a good clip and the honey filled comb is wider than the brood. (as usual for me). Once they build out wider into your next empty frame it forces the next to be built all kinds of ways but straight as well and theres where I am now. I have been tossing the idea of follower boards between them to try and contain this. (The follower boards I have made do not close off the hive and are the size of the frame itself). I do NOT want to put foudation in at any cost because I had the same problem with it as I do without it. That problem is honeycomb on brood comb getting way thicker than the rest of frame. I also have a newer swarm I caught and they are building straight now. They are 1 month behind these packages and I gave them a real small piece of comb to start. I am considering staggering follower boards every other frame until the comb is built out. I cant find much info on this topic at all though one way or the other. Also thinking of spacing 9 frames in ten frame box and not finding a lot on the topic as well. Thats wheres I am to date with our 3 hives from nothing.
Foudationless for me no matter what. I may make a post of this elsewhere on the forum.