welcome paco ! Funny, I had to double check to see who's post I was reading, yours or mine (From a month or two ago!)
We have eerily similar story's. I have made a few, but only 2 that survived
When Im building bows,I don't concentrate on the finished product, concentrate on your work and the skills you gain.
If the bow fails your still enjoying yourself
I think I broke about 3 bows, but I learned something from every failure.
And I keep repeating, you aint makin if you aint breakin...
By the way, the two that lived are both unbacked white oak ...