Everyone is aware of the quality guide
https://www.simplify3d.com/support/prin ... eshooting/
In it, it states that 2 issues with gaps between infill and outline are
1)Not enough outline overlap
2)Printing too fast
I have found a third.
If you have had to increase your outline gap to MORE than 30%, you may have an option in Oozing control turned off.
I found I had turned off "Only retract when crossing open spaces" and it created a NIGHTMARE.
My mouse is a little twitchy sometimes and I didn't realize it, but I had unchecked that option and ALL edges of my infills and outlines were short by 1-2 mm.
Hope this helps others who have had to deal with it in the past.