Of course you may repeat the test if you are sure of the moisture-dry density relationship of the natural soil you used. Naturally, one should expect increase in moisture content with increase in aspect ratio. However, this will depend on the dominant clay minerals of the soil. If it is a highly swelling clay, decrease in moisture content should expected, but if it is less swelling clay, probably it should be opposite. 

We have a paper showing how OPC of compacted soil changes with increasing fiber content. Our data show show that OMC increases when fiber content increases from zero to 0.8 or 1.0% and then decreases when fiber content exceeds this value (Please see our paper published in Water, Air and Soil Pollution 2007). This range of fiber content may be considered as a threshold value in terms of compaction characteristics, and its value may depend on the soil type, fiber length/type.