That do seem low for an OG. I can't tell exactly how much honey you used, but at .5 lbs honey you should have around 1.040. You may have had too hot a sample, which (I think) would make it more viscous and therefore thinner (?), that is, if you used a hydrometer. Make sure you're using a long enough rest for conversion and sparging well. Check the crush on your grains, too. That could also be a culprit for low efficiency.