Extended length increases swing weight substantially.
I used Prince RipSticks (29") for years with no problems until I strung with poly string. That caused a wrist injury which lasted over 6 months.
I would suggest you actually tailweight the stick so you don't have so much weight on the head. It might actually help the strain on your shoulder.
I tailweight my Pro Staffs which are 360 + gram sticks and they swing even easier because they become more headlight
4 Pro Staff 85 StV, 2 PS StV 110, PS Chicago 125 & 110, 3 Bab Aero Origs, 2 KPS88, Donnay X-Blue 99, Snauwaert ATP Woodforde, Hi-Ten 30