Jay,
If you can find a copy International Bonsai 2006/No. 1 it was devoted to Flowering Quince. I picked up a copy shortly after Shim and I picked up our 3 Toyo Nishiki Quince. One of our club members was giving away copies of his older issues to anyone who wanted them. It has the following articles that may be of interest.
Developing Japanese Flowering Quince Miniature Bonsai, By Keizo Tachibaba, Craig W. Risser, Wm. M. Valavanis
How To Grow & Style Japanese Flowering Quince Bonsai, By Kageo Ono, Craig W. Risser
Maintaining Finished Bonsai - Part 7 Japanese Flowering Quince, By Kageo Ono, Craig W. Risser
Japanese Flowering Quince - Cultivars & Bonsai Training, By Brent Walston
The Seasonal Beauty Of Takeyyama Bonsai - Part 24 Quince, By Hiroshi Takeyama
Creating Clump Style Japanese Flowering Quince Bonsai, By Jiro Fukuda, Craig W. Risser
Dorie's Shohin Bonsai Tips - Japanese Flowering Quince, By Doris W. Froning.
Good Luck!
JRob