For what its worth, after you break in your engine, it should require little adjustments to get it just right. Given that this is a Force motor, you can post again in the Engine forum and check Ofnas FAQs.
http://ofna.com/guide.html
http://www.rctech.net/forum/nitro-of...e-28-carb.html
http://www.ofna.com/pdf/52217-Force-28.pdf