all of a sudden the engine came alive comparatively speaking- revved through 6200 rpm wot and just begged to be given the handle. This was an improvement of over 700 rpm and made all the difference.
Great result! 6200rpm is what I'm getting on my j30a6, I thought the older J30s made peak power at around 5500rpm? Might need a bit more pitch to make the most of torque ?