Unless you have a fuel flow sensor and you are knowledgable on how many GPMs are required at stage, during first gear and the rest of the gears and at the end of the run then EGTs at certain points of the run are required to make sure all is OK and put you close to the right tuneup or on the right track. Reading the plugs and bearings ONLY tells you what happened at the end of the run from about the 1000 ft mark on on. Yes, there are factors that affect EGTs but overall they should be with certain boundaries at certain points such as idle, stage, at preset times in the run and at the end of the run to get you into the ballpark. EGTs are way too slow in changing to really use them for fine point tuning during the run. If you want to check the accuracy of the idle EGTs then use a heat gun on the exhaust pipes and correlate it to the logger temps. What is happening with Brian just needs to be figured out. There is a problem somewhere in his motor or fuel system. Just because we can't figure it out on the internet doesn't mean he should ignore it, that may cost him a lot of money when he takes it to the track. I think Brian should bring the motor up to stage RPM with the data logger on and see what the temps are then. If they stable out with an average of around the 625* then the problem is in the idle circuit/setup, if they shoot up then the problem is in the whole setup. Since this is all fairly new to Brian something that we do all the time a certain way may have been done differently by Brian.