I have had a chance to try a few of the suggestions I have received. Not discounting the others, but just have not had time yet to try them. Here are the results so far:

1. Rectilinear infill pattern (45 degrees) at 20%, 250F --> significant improvement vs the honeycomb at 20%
2. Change to 40% infill, increase temperature to 260F --> a little more improvement vs #1 above.
3. 40% infill, 250F, increase the flow rate by 10% --> slightly worsened vs #2. Too much plastic extruded.

Next I will try reducing the flow rate by 10%, 40% fill, and 250F. But based on what I have seen so far, I think the real keys are changing to the rectilinear fill pattern and increasing the infill from 20% to 40%. Since the result worsened when I increased the flow rate, I want to see if reducing the flow rate below my standard esteps makes an improvement.

I will also have a look at the suggested 90 degree infill pattern to shorten the thread lengths.

Jim