The layout of the track really lends itself to the type of racing the high drag package was trying to create. Long-ass straights, slow corners. Long straights (that are actually straight) lend themselves to slingshot passes while slow corners help minimize the importance of aero grip through the corners. That lack of aero grip when following another car through corners is what causes "aero push", which is why they went with low-downforce for the package this year since at the vast majority of tracks this was a bigger issue.
However, that low downforce package (and the lowered drag as a result) makes it more difficult to slipstream a car down the long straights and pass there (where the grandstands are). Where the high drag package from last year failed was that it also increased the front splitter and added much more downforce to the cars at a track (indy) where the cars take the corners much faster than Pocono (to say nothing of Michigan). If the smart guys at NASCAR could come up with a solution to make the cars punch a bigger hole in the air at speed while still allowing a trailing car to follow through the corners, IE high drag but low downforce/aero dependency, it would really change the was the Rovals are raced.
