I don't know anything about twist barrels being more subject to pitting than damascus barrels. I haven't heard that one before. A person may see more pitted twist barrels than grade 2 and higher damascus barrels, but that is because grade 1 twist barrels are far more common. Also, there is a general feeling among collectors that the higher the grade the more likely that the gun was cared for
and cleaned. Consequently, we see many high grade guns in high condition.
I can't determine much from the photos. Rough bores do not affect shooting much if at all. From what little I see from the photos, I don't see anything that would prevent me from shooting through those barrels.
Some people shoot low pressure loads through composite barrels. Others, including me, sometimes shoot fairly stout recoil and pressure loads. If you feel that you must limit yourself to low pressure loads, that would be your choice after considering the remaining wall thickness in your barrels.
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