If you're concentrating more on the running than the riding you might want to cut back the length of the bike before the run on your bricks. Maybe 20-25 minutes of bike before the run, just enough to get the feel of biking rather than enough to tire your legs out. You don't want to hurt yourself by pushing it too much in the last few weeks before the race.

In the same vein, I'd cut out or cut down on the last run before the race.