Dave, sorry I could not get back sooner, I had to step out for several days.
Anyway, to answer your question I have used precision of 9, 5, 1,0.1, 0.5, 0.9.
makes no difference.
But since I asked the question last year, I have changed the units from lbs/cf to g/cm3 and looks like that will help.
again, sorry I did not thank you earlier.