The following is just a suggestion. If you narrow your ovals 10 inches between east and west sides and place your yard entry on the west side, you could place your yard lead switch almost at the top (north) of that west side. That way, you can work the yard and add one arrival / departure track (siding) along that side and not "foul the main" while switching. Using a west side yard lead also keeps the Timesaver area closer to the east edge.
Of course, I don't know what you had planned for the middle of the space, so this suggestion might be totally impractical. Still??
Chuck