Out of curiosity, do you have the OEM intercooler still fitted? If so, can you see any oil deposits on it? The OEM IC's are prone to leaking and if they are will hamper engine performance. Do you have any after market manual boost controllers fitted? The EGT's seem a bit high for my liking, which could be the result of a leaking IC, not enough air being pushed through into the motor will result in a richer fuel mixer which means higher egt's.