there isn't an "improper lane usage" in the csa - the term is state specific.
i got one in idaho a long time ago and was called "failure to maintain lane" under similar circumstances. this warning will cost you either 3 or 5 points - times three for the first year, times two for the second and times one for third and last. Then it drops off.
here's everything you never wanted to know about csa scoring: http://csa.fmcsa.dot.gov/Documents/SMSMe...