So I’m using Simplify3D and a dual head TAZ4. The heads are calibrated and I’ve figure out the offsets accurately enough. But whenever the tools change There is a gap in the print so it really messes with things when it’s switching back and forth between heads. I’ve tried many different setting tweaks and can’t quite get it right. Anybody have a dialed in Simplify3D profile for printing with supports?
I have not seen any posts about this on the forum. You might try the S3D forum or S3D support.
Good luck.
I can’t afford a dual extruder for my TAZ 
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This instructional video from S3D might help…
http://www.youtube.com/watch?v=qPufaJhyqME