Something is amiss, as I was substantially heavier than you and even when I was riding well used, very entry level, factory built, single-wall, 32-straight gauge spoke, on no-name hubs, I can count the number of spokes I've broken on one hand. I rode 1,200 miles last year and am over 1,800 already this year. Only on the last 1,000 miles have I had better wheels but still factory built, upper entry level stuff. My first hand-built wheel just went on the back of my touring bike about 200 miles ago.

You could try having the wheels hand-rebuilt in a 3-cross pattern with DT Swiss butted spokes (the builder who did my touring rear wheel explained to me why butted spokes are actually less likely to fail than straight gauge). An alternative would be to do what I did (not because I was breaking spokes but just because I wanted to bomb-proof for upcoming solo touring) and go to a 36-spoke hand built rear wheel on a double-wall eyeletted rim and decent hub. I got a Salsa Delgato rim with DT Swiss butted spokes and a Deore LX hub for about $200. The builder is well respected in an equally well respected shop and told me it would be an excellent riding and extremely tough wheel. It did weight about 100g more than my old wheel but I really don't notice the difference and it rides great.