Your fitness is not bad if you can sustain 85% for an hour. In fact, it's VERY good if you can sustain it at 85% for an hour. I've found that, for me, the only two numbers I need are my LT and my recovery training HR.
Coupla things. I don't wanna bust your bubble, but my guess is 149 is not 85% because 85% is real difficult to sustain for an extended period. This could be due to a few things. Your max HR is not 173, or your RHR is lower than normal. Try taking your RHR in the morning and use Karvonen to determine your percentages.