Those are very nice bows, simk! Beautiful shapes and flawless glue lines.
I'm also very interested in this topic, as I'm also planning to make laminated bows out of European bow woods in the future. I'm also happy to hear that European hornbeam does well as a belly wood, as I own a small forest with lots of European hornbeam in it
Even though I haven't built any laminated bows yet, I have some thoughts about black locust:
Bruno Ballweg, a well known bowyer from Germany makes laminated bows with black locust as a corewood.
After hearing about this, I tested and compared the properties of black locust and Osage: both woods were sold as foreshaft materials with a diameter of 11/32 ". I spine tested both kinds of woods. If I remember correct, Osage spined at about 35. Black locust spined significantly higher at about 50. Black locust might not be as good in compression as Osage, but it's much stiffer with the same dimensions. That might be an ideal candidate for a core.
I'm very interested in your findings!
cheers,
lonbow