According to my calculator, two light flaks using greased, working against mallet repairs against a pyra are going to need 24 shots each taking 16 seconds.
Thats bad.
However, those same light flaks will only need 4 shots each to kill the perma taking .66 seconds.
As everyone has been saying, without another ship stripping armor, this isn't viable. However, if armor is stripped, this becomes godly.