How to use SMEFTatNLO correctly? (4 Fermion contributions)

Hello,

I am trying to use the model "SmeftatNLO" from http://feynrules.irmp.ucl.ac.be/wiki/SMEFTatNLO.
My plan is to compare cross section for the top quark pair production with the default sm model and the SMEFT.
A month or two ago, I tried to use the SMEFT, but the cross section was too high, compared to my QCD cross section. Now I have read a paper, which seems to imply that the relevant controbutions to ttbar are the dimension 6 four fermion operators.

I have tried to understand the param Card, it has multiple blocks.

I expect that, in order to have relevant calculations, and be able to do what the paper did, I need to leave following blocks unchanged:
 INFORMATION FOR DIM6
 INFORMATION FOR DIM64f

At the same time, I am unsure if it really is wise to simply put all the other blocks to zero. That is why I wanted to ask, if it makes sense, to only leave these two blocks unchanged, in order to get the values from the paper https://arxiv.org/pdf/2008.11743.pdf .

Best regards,

Christian

Some more information just in case it proves useful:

My QCD calculation with the default sm and MSTW2008 at LO was of about 457 pb.

Using the SMEFT and only using the block for dim6 (not even dim6f2 or dim6f4) got me a cross section of about 457 pb too.

Now, using the standard param card, I got a cross section of 539 pb, which seemes far too high to me. From my understanding, the deviations should be very small at 13 TeV.

The imported model was SmeftatNLO-LO, but I have also used SmeftatNLO-NLO for my NLO calcs.

If I can provide any more information, please let me know