TRX, are you sure it was the bow? Just kidddin'. 150 Class, I agree, you'd think that the X-TEC would be more forgiving, given the extra 3 1/2" ATA. I've shot the X-TEC numerous times and have yet to find it to be "jumpy."
Shorter ATA bows have their pro's & con's - but I have never been a big fan...cough,cough,outback-