IMO, you're fine. Yes, there are some docs (a relative few), who want to call out BCR at 0.03. Most, however, subscribe to the general concept of "2 or 3 successive rises above the detection limit"--so whatever the detection limit is, the wait for that line to be crossed, then wait a bit for a re-test, then another time after that.
The idea is to eliminate noise. And, the lower the detection limit, the more likely noise is going to be. And, as we've seen in here, noise drives some guys nuts. My current lab (Labcorp) runs a detection limit of 0.006. Previously, where I lived, the best they had was 0.04. Yes, it appears that now I'm "more undetectable", but I also know that if it starts to move, I probably won't do anything until it gets somewhere close to 0.1 anyway.
And, here is where I put on my analytical chemist hat, and point out that the OP is asking about
precision, where he really means detection limit. And now I'll take that hat back off and spare the lecture about
limits of precision, relative accuracy, detection limits, and other statistical functions relative to chemical analysis.
Age at Diagnosis: 56
RALP on 2/17/15, BJC St. Louis, Dr. Figenshau
58.5g, G3+4, 20%, 4 quadrants involved
PSA Non-Detect since April, 2015
My Story: www.healingwell.com/community/default.aspx?f=35&m=3300024