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From what I hear it's very hard tuning cams as aggressive as Jun on a stock ecu. Props to your tuner.
Yes, the JUN cams are really finicky to tune. I knew that before I bought them but was reassured that in the hands of a capable tuner plus the MIVEC, I would be very pleased with the results.
RyanTech has done great work with my evo thus far and I'm looking forward to the next round of mods.