I have WH13 -14 spokes on my Dyad rims and heavy XL SA hubs. Bike + me is 243 on an easy day and 290 on tour. Nothing is going to stop these wheels. These spokes are hard to get, Peter White won't ship them anymore, because he effed my order twice, doh. OTOH My Rohloff ended up 32H and plain 14g, they really don't allow 13g. It seems solid also.

With the OP having heavy rims and bike, plain 14g make NO sense. Especially with any derailler. IMO... One heavy tour BF guy has busted 4 wheels, over 60,000 miles of trips.