Is the plan to use your analyzed meshes in an actual replication of Mizuno R20 test? As a side comment, it's a bit strange to me that Mizuno/Rothwell strongly recommend accurate analytical procedure for gas evacuation and don't similarly suggest rigorous analysis of the prepared meshes as well (at least it's not part of the original paper).
It is not strange because they know proper degassing Is more important for obtaining excess heat. The level of excess heat has been variable but getting it depends strongly on the proper degassing protocol. I think this is not stated very specifically in the R20 paper but in the previous paper which is a must read it is more detailed. The importance of degassing for a long period is also stated by Parkhomov who did that in his latest Nickel excess heat paper (the one presented by Bob Greenyer at ICCF 22). Bob also says that Piantelli insists that step is key for success, and Bob also has found some back up to this in the work of Thomas Graham in the first half of the XIX century.
This is Graham’s paper that is surprisingly familiar considering is more that 100 years old.