The turkey breast will hit a stall, so don't worry about that. The temp probe placement may be giving you a higher temp reading that actual...did you push the probe well into the breast but not reaching the bone? When the breast reaches 165IT on your probe, you may want to use another remote therm just to check in a couple other places within the breast. Or, you could remove the probe and re-insert in another location, but again, you want the probe to be well inserted into the breast.