How much "extra" lash does it take to send up a red flag that a cam/lifter is going bad?

We broke in the cam for the 445 in my Fairlane Hardtop with no issues.  Solid flat tappet, nitrated cam, EDM Crower lifters, break in oil and inner springs removed.
2-2500 rpm for 20 minutes, or so. All went good. Currently, I am at break-in plus about 50 street driven miles. Easy on the rpm's, but plenty of accel and de-cel.

This past weekend, we pulled the rocker assembly's and swapped out the break-in springs for the ones called for by the cam we are using.  Everything looked fine upon inspection and going back together.  I run through the valve lash adjustments and all seem fine, most are a hair loose...a couple .001, 3,4,5 thou. maybe, from their original setting. I think, okay, wearing in a little.  I reset them and move on.  I got to #5 Intake and it was .025 off it original setting.  I was setting them at .016 and this measured .041. 

Should I reset it and put some miles on the car, and remeasure. Or should I dig into it now?  As of now, I have not cut open the oil filter.  I am working on getting a cutter.

Anyones thoughts appreciated.

Mike

Hoping to get this together for the FE Race and Reunion @ Beaver Springs Dragway  the end of April. Still have the fuel system, wiring, weight reduction, alignment, lettering and it seems like a ton of little things. First time putting a car together for the track, but it is getting there. Looking to run Nostalgia Classes, hopefully mid 11.'s