Question for Holley carb gurus

I've been reading on FABO about what is supposed to be the proper way to set the throttle blades on a 4 bbl Holley. I was having problems with it and so I checked my 750 VS. I set both the primary and secondary throttle blades to only show a "square" of the idle slot. However, before this the secondaries blades were almost completely closed and not exposing ANY of the idle slot and the primaries were open so far that the idle slot was almost completely uncovered.

My question for y'all is what problems would the old setup have caused? I know that I did have problems getting it to respond to idle mixture needle changes and the position of the primaries explains that. But what other problems might have been happening?

Thanks!
:BangHead: