i tend to work in small areas.
if i'm doing a continuous line design i just go with the flow of the pattern.
if i'm doing individual motifs i'll start in the center of the quilt and work my way around and out.
i don't think the stitch issue is related to your foot - that horseshoe design is highly regarded by many professional quilters.
i think the stitch problem is just a rhythm thing kinda like patting your head and rubbing your stomach. it just takes some practice to find your groove.
it might help to put on some music that you like while practicing to help with the rhythm.
for echo quilting i like the Big Foot - its great for following a tight echo.
here's a link
http://www.littlefoot.net/index.php?...products_id=43