No. Front-loading is recommended for high-fraud consulates, such as yours. There may be better info on threads pertaining specifically to Pakistan (S Asia forum), but it is essentially including an abundance of evidence of the relationship’s bonafides, with the petition. The requirements for the K are minimal, and for high fraud consulates, showing the minimum (one visit) is not enough.
Taking new evidence to the interview is fine, but sometimes the IO refuses to look at it, as the decision has been made already. Hence “front-loading.”