BarcaLounger recliner, style #7-4404?

Very nice chair, in great condition, but it seems to have been built for a much taller, heavier person. It reclines nicely, but when pressed into FULL recline, it bounces right back into partial recline, like the springs are too tight. I tried messing with the adjustment screws, but they did not affect this behaviour in the least. How can I get it to fully recline and STAY?