So I ordered two sear springs, 7.5 and 8mm. the stock is 6mm.
the 8 was too much, and created a sharp jerk. The 7.5, which by my caliper was 7mm, was much better, and gives me a trigger pull of 2 to 2.5 lbs. (the wheeler gauge is not precise)
that feels pretty good, light, but not too light.
FYI I also have a Cajun adjustable sear and hammer, which they say increases the pull by .5 lbs. but it is also snappier than stock.
I wonder that if with stock hammer the 8mm spring would offer a smoother pull.