The inconsistencies are frusrating, I know. It seems like the captain, by taxiing slow and using LRC, is trying to over block for the trip. Even small increments of over block will pay off the long run. Let's say the captain makes $65 per hour and he overblocks an average of 45 minutes per trip throughout the course of a year, that equates to an extra $2,340 per year. Does the captain delay setting the parking break after stopping at the gate? That may explain a lot for the slow taxi and LRC. The captain may also be using LRC to save the company money on fuel expenses. As far as the last leg is concerned, communicate your concerns and present a plan that both will agree upon. If you want to slow things down on the last leg, do everything by the book but at a slower pace than usual. Don't let him rush you. At least the next time you fly with this guy, you will know what to expect.