Sorry to hear you had arm issues with the racquet. The arm issues you mentioned could be simply due to the change in weight and balance, and that change aggravated your arm. The QTour is flexible and has plenty of mass to absorb shock, plus we had four very different players hit it, and all raved about the comfort -- consider we hit it with poly strings, too.
I remember when I started testing racquets, my arm went numb after a month due to the constant change in weight/balance. I just increased my stretching/training and used ice until my body got used to the constant change.