How low is the tension and what string including gauge are you using?
I don't think low tension would cause it, but you may want to increase comfort by going to a smaller string and 30 lbs or so.
I've had a bad wrist since summer (Super light hollow racquets - RipStick and Pure Drive - high tensions - 60+).
I'm using Donnays and old Prince Sticks now. They are solid, 12 ounce sticks and 35-40 lbs tension with 17 ga poly strings. My arms and wrists are feeling tons better.
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