Rear Diff Bushing Install - Lessons learned

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Have put on approximately 1000 miles since installing the Z1 polyurethane rear differential bushings. No noticeable difference in noise or vibration. However, on a recent inspection, I noticed that the rear bushing appears to have eased rearward slightly (i.e., less than 1/8") in the subframe. Is this type of movement within normal limits? There is no gap between the mating surfaces of the differential and the rear bushing and all bolts/nuts were torqued to spec when the new bushings were installed. Thanks in advance for any input.