Do S-Jets benefit the XR600's?

Just curious if s-jets work better than normal jets for the XR600's? I need to do some rejetting due to the 600 living in CO up until this past Dec. It ran strong up there and now it is a bit doggy, just doesn't have the snap it did up in CO. To add to it, I've also just put on an aftermarket exhaust system, WB header and Yoshi muffler. Any suggested settings for here in the Phx AZ desert at around 2000-3000 ft?

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