Deing,
You should not worry about high EGT limits, there is no limit on EGT on normally aspirated engines. What counts is the CHT several minutes later, 400°F is a limit for long engine life, anything above 420°F needs immediate action.
The best use of EGT indication is to establish your location on the combustion curve in order to finetune your engine parameters (mixture being the most powerful and least understood engine control in the aircraft).
This being said, the only time I would want to see EGTs in the +1500 range is during very high power cruise, certainly not during take off and climb. During takeoff and full rich climb you want to see EGTs around 1200-1300 if not ask the shop to enrichen the full rich setting on the engine. Most TCMs come from the factory with too little fuel flow for proper full rich operation.