Hey Lucky,
I too am a lefty, and our lines are generally pretty much almost generic lines.. In terms of adjustments, the 2-1, 1-1, an arrow here or there, even for the soft 7 pin leave, (moving your address position back 4 inches on the approach offer solves that problem for me!!).. Basically, today u found a line that worked, well done mate on that, obviously u gunned it once u adjusted..Tomorrow that line may not work, keep an open mind, and always watch your ball where it breaks , where it enters pocket, and how it drives through the pocket.. That wil give u a lot of info to work with..
It's taken me a while for me to adjust earlier, and trust my judgement. Now if ball isn't working for me, I make a generous move nice and early, might take a frame or two to get it spot on, but the move has saved possible opens and splits.