I call mine "meandering along the ditch" and yes, under the influence might have something to do with it in my case. lol
When you do yours, do you slightly pull the seam apart from both sides so you can get right into the ditch? That seems to help. Also, when the seam changes direction, do you use a few small stitches to guide the needle over to the new low side? That works well too. If in doubt, I use monofilament thread in the top and SID to my heart's content.
There is a magnifier with LED lights that you can hang around your neck. Not sure how it would work for machine work.
Remember, after the quilt is washed, most of these off SID lines will disappear in the slight pucker of the quilt. No worries.