Very narrow seam allowance on a serger

Narrow, mini or micro seams on a Finishing Touch, 14SH654, Serger.
The Finishing Touch does not have an upper looper bypass, so currently it can only do a 1 needle two looper stitches or a 2 needle 2 looper stitches.
Today I am going to do one needle 2 looper stitches, trying to get the narrowest seam allowance possible, basically getting somewhere between a standard overlock stitch with seam allowance and a rolled hem, but using it as a construction seam. As seen in sportswear, swimwear, and undergarments.
Test fabric today' are lightweight cotton/lycra, poly/lycra, two different wt scuba knits (265gsm and a 325gsm), tee-shirt, medium cotton/lycra.
Also doing a small bit on flatlocking.
Be kind, costs you nothing, maybe worth everything to another person today.