Hi Doofa,
I don't have final results yet, but partial once are encouraging and I am glad to share them with you!
After failing the first time I amended 2 things in my recipe and tried it again. First, I reduced the percentage of the calcium lactate gluconate from 2.5% to 2% because I found over the web that this is the common ratio (it contains different calcium content in comparison to the pure calcium gluconate). Second, I put the mixture in a semi-sphere silicon mold and froze it before placing it in the alginate bath. This worked wonders! The results where perfect spheres which I could handle easily and produced wonderful mouthfeel.
Although I solved the texture/shape issue, I still had plenty of bubbles in the mixture and it was opaque white. I thought about trying to ice-filter it but then I thought again about the color and decided I actually like it this way, because it adds to the surprise effect of the dish where you can't see what's in it. As for the bubbles, I intend to use a magnetic stirrer the next time instead of a hand blender to try and introduce as little bubbles as possible during mixing. In either case, the bubbles weren't a problem when I froze the spheres so it's more of a visual preference.
Cheers,
Tom.