Well, I just got off the phone with the guy from HKS and he is saying that they have "several WRX's there and haven't seen this problem". I suggested he come here to search and market his product
In any case, he suggested I use the standard EVC IV because the cost of the Pro is through the roof. Nice to see someone in a company not trying to gouge you! And they were much more responsive than ApexI.
Dan from Godspeed also said he hadn't seen high EGT's with the SBC-id, so maybe I will just go with that.
Anyone care to comment on High EGT's with a EBC?