I've come to the conclusion, that I can only tell the board how heavy I want it to pull to an extent. In the end, it's going to want to be a certain weight, and so far for me, about 1/10 will come in at the weight i'm looking for (50's). Most come in at the low 40's and upper 30's. I also don't back my bows, and don't heat treat. Yet. BUT, they shoot great and are a blast to shoot. To me, in the end, that's why the bow was made. So don't get too caught up on the weight. I don't think that bow would've lived long anyway looking at the way it broke (I have a lot of experience on broken bows as well!) The one on the far left may have had a better chance. I started a thread not too long ago on tillering preferences. And I forgot what got my early shooters was tillering by hand and shooting the bow in the last few inches. Once you get her pulling to your draw length, after many many shots, and you gradually work her up to it, then put her on the tree (still at an inch less than your draw IMO if using peg style trees) to see your tiller.
I had 5 straight break on me, cause I forgot that one very important technique, but the gang reminded me in my thread, and it worked. It brought my confidence back as well, which when it comes to tillering, can make or break the whole process.
Good luck on the next one, and go at it full steam.