Hard to say without knowing the design airflow/ton. But if that remote RH and temperatuer is correct, you should have a dry coil. I think protables are usually only 350CFM/ton or less, so I'd say a 16F delta T with humidity that low isn't very good.
thanks for that. ive done some research and have the factory service manual. its a 2speed/13000btu unit. what i found odd is the cfm in the specs, low=450 and high=650
with the unit being a little over 1ton, 650cfm is way too high for job. BTW the coil is NOT dry, it condensates and a pump gets it outa there. i was getting 20f delta T on the low setting and 12-13f on the high setting. its a quality unit/ its got ebmpapst impellors for the condensor and the evaporator. so what i did is run an extra 10uf cap in parallel w/the low speed cap. that increased the cfm on the low setting and got me 16f.