I have ridden 24\28 spokes wheels since I was 250 and never had any issues. I currently have Bontrager Aeolus 5 on my Emonda which are 5 years old and never had a lick of problems. I just bought a Trek Domane and have the Bontrager Aeolus Pro 3v, both of those wheel sets and 24 spoke wheels. I also have Boyd Altamont's on my commuter that I have had for 5 years that have worked flawless and they are 24/28 spokes. At your weight, I think 32 spokes are overkill.
