Listen to the mirai podcast with telperian farms. Not sure on that spelling..
I just thought it was interesting and thought it might work with quince rather then cutting back in summer and fall.
Basically would wouldn't cut the tips where all the auxin is and you would leave that to grow and be strong. You would remove leaves except for the tips which would stimulate the plant to replace the green. Of coarse quince could just flush out leaves with no shoots. Every time I cut back quince to like a pair of new leaves, on a new shoot, I just get one new shoot that develops and grows like crazy. Real hard to get the regular quince to ramify as I'm sure you are aware. I'm hoping to figure it out as I am starting to get a good amount of regular jap quinces. I want a dwarf but just haven't purchased one yet.