I am coming late to the conversation (and I only looked at it quickly,
sorry), but I have two additional suggestions:
1. Depending on the deformation of cells and the PDE in question, it
might be important to check if the quadrature degree is high enough to
not contribute to the overall error. This is easy to check by
increasing the quadrature degree in all places but you can of course
go back to your PDE and check what you need.
2. Did you play with linear solver tolerances to see if this matters?

On Tue, Sep 22, 2020 at 6:31 PM Wolfgang Bangerth
<bange...@colostate.edu> wrote:
>
> On 9/22/20 4:27 PM, Wolfgang Bangerth wrote:
> > I wished every student project were as comprehensively explored! :-)
>
> I tacitly assumed that Maurice Rohracker is your student. I didn't mean to
> imply that the work you're doing is at the "student level" -- quite the
> contrary: What your reports show is just really impressive!
>
> Best
>   W.
>
> --
> ------------------------------------------------------------------------
> Wolfgang Bangerth          email:                 bange...@colostate.edu
>                             www: http://www.math.colostate.edu/~bangerth/
>
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-- 
Timo Heister
http://www.math.clemson.edu/~heister/

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