Varanus - it is quite common for a goshawk to refuse rabbits at first. My female NA is now five and is deadly on jacks and cottontails, but her first years she would not chase either until November. I think it had more to do with maturity than weight or a drop in temperature. I would just focus on birds, carhawk if you need to, then try rabbits a couple of months down the road. Best of luck ...
