Long discussion on another board, I won’t trouble you with. It is compatibility you are looking for rather than any coefficient of expansion. Bullseye, Uroroboeros and Spectrum96 are all good tested compatible glasses. Each has their supporters. Find a good supplier near you and use what they carry. By sticking with one manufacturer’s fusing compatible glass you will have good results generally.
Devit nowadays comes mostly from inadequate cleaning of the glass before firing.
Small bubbles are a feature of fused glass whether you start with the glass that has more seeds like Uro or Bullseye, or that with less like S96.