If so, you have a large amount of haste already, so it's possible that balancing out the stats more would lead to more potential dps. The haste>whatever rule for supremacy is a guideline. Simcraft will pretty much always be more correct in the stats you should go for than a general guideline.
As for gosup vs gosac, the difference between the 2 single target is negligible, but gosup is more forgiving. The second you can cleave gosac pulls ahead very, very quickly.