Press out the store fold, shake the fabric and fold by sliding the selvage up or down until it hangs nicely, then give it another shake and use that fold line. I fold mine a second time if I'm using the June Tailor Shape cut ruler, otherwise I cut it at 22 inches. I've never had a dogleg since I started pressing out the store fold.
Edit: I find the line on the JT Shape Cut to be very thick and I need to be careful that the edge of the fabric is exactly ON the line, not hidden under it as it could a little crooked with the line so heavy.