Taking 10 minutes off the shiur would probably not cause a loss of an extra level of a mostly superficial grasp; it would probably cause them to be unable to learn the entire daf.
That being said, it would seem that R’ Chaim Kanievsky agrees to your basic idea:
???? ?????? ???? ???? ???? ??? ?????? ??????? ????? ???? ?? ???”? ????? ??????? ????? ?????? ?????? ???? ?????? ??? ????? ?-5 ???? ????? ????? ????? ?????? ??? ??? ??????
(Igros U’kesavim siman 103)