There is no necessary downside in making the point you suggest with respect to Huma Abedin. It may be an item--perhaps one of many--being saved for an election eve address or one in September or October. The advantage that we have is that there is a tremendous disparity in factual ammunition. Donald Trump has an overwhelming arsenal; Mrs. Clinton has only the endless iteration of a stale, but still false narrative.
Damn the lies & Damn the liars! Elect Trump! Full speed ahead!
Classical example: Reagan vs. Carter, 1980.