Sol,
Never crossed those two but I've got wide leaves from a lot of different sources.
Your crosses all sound like good ones. "Jabba the Hutt' gives VERY wide seedlings so that should be a good mating. I've also liked the 'Waldmeister' seedlings from selfing so am betting Erwin's #1 will give some nice seedlings too. Generally I don't go for those smallish compact rosettes but 'Waldmeister' speaks to me.
My crosses with 'Silver Song' have been to get purples in that shape but that line got side-tracked when the pinks and stripes appeared. The cross to 'Blue Whale' was of course for size and blues.
Like your quotes from the Italian masters!
Kevin