The jam is delicious. I used less sugar than in an average recipe. OK you should probably consume it a little bit quicker but that's not too difficult.
Nice French books about jams:
Le Larousse des Confitures, Gelees, confitures, chutneys (pour le plaisir gourmand des confitures maison), Larousse 2009.
Mes Confitures, Christine Ferber, La cuisine des chefs, editions Payot; Rivages, 1997