I read a lots about prostate and
PSA test. As I can tell, as your age 63,
PSA 1.84 (05/08) seems good (low). Your trend showed that 2006 to 2007 had a big step (0.7 to 1.79) because the velocity is 1.09, which >0.75/yr, but since that (03/08 will not count) is 1.84. I think it seems that your "new" level is about 1.8, but this new trend need to be proved - if you repeat it in a couple years, and it will stay in this level.