Fused glass honeycomb mandala

I’m working on my second honeycomb piece. The first one looked amazing, and then I tried fusing the top details onto the base and it melted into a puddle of color. This is a photo of my second try before fusing. I would like those top details to nicely melt, just a little bit, into the base. The problem is that when you heat all that glass together, it must heat and cool at the same rate. If those thinner top pieces cool slower than the thick bottom, they will crack, or the whole piece will crack. It gets complicated. Stay tuned to see if I can figure out a very slow fusing schedule that will heat and cool everything to perfection.