9 Piece Table Garniture, Napoleone Martinuzzi, Verri Soffiati Muransesi
(V.S.M) Capellin Venini & C., Murano, Venice, about 1930. 96.3.20
The books could be useful. They contain basic information about avoiding bubbles and devitrification, plus a few ideas on using temperature and other means to create bubbles:
Culler, Rene. Glass from the Kiln. Atglen, PA: Schiffer, 2010.
Walker, Brad. Contemporary Warm Glass.... Clemmons, NC: Four Corners Intern'l, 2002 rev.ed.
Watkins-Baker, Helga. Kiln Forming Glass. Ramsbury, Marlborough: Crowood Press, 2010.
I also attached a list of websites and articles that address creating bubbles, many using the techniques you have tried, but I hope they include more detailed information to help you refine the techniques. Sites, like these, that describe various techniques for eliminating bubbles -- perhaps you could experiment with adding (instead of eliminating) bubbles using these ideas: Warm Glass Tutorials and Glass Facts Reduced Bubble Fusing Part 1 and Part 2. There are additional websites listed in the attachment.
Using powder or frit of various grain sizes can cause bubbles to form between the grains. (pate de verre, from powders, can appear opaque due to fine bubbles). Walker and other sources address the use of powders and frit. Glassblowers also add bubbles to their glass, for example: Pulegoso. GlassFacts has additional information on the technique was used extensively by Napoleone Martinuzzi and Seguso Vetri d'Arte Murano-Venezia, Italy in glassblowing. The 9 Piece Table Garniture, pictured above, uses pulegoso techniques. Additionally, The glass of Frederick Carder. NY: Crown Publishers, 1971 that describes his bubbly techniques.
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