My stoker is an elite runner and very competetive. 25 years of running is taking its inevitable toll, so she is starting to make the transition. She still needs a race situation, so we are preparing for a local time trial. Our bike is set up for club riding. What cheap modifications can we make to our bike to make it feel faster? We have 28 mm. Continental Four Seasons now, and I was thinking of getting a lighter tire. What can I safely place on a tandem? Would a 23mm tire be safe? Maybe a more aggressive saddle for my stoker? She has a Trek WSD saddle. Maybe a Terry Butterfly or Fizik Vitesse? We were also thinking of trying OOP. Suggestions?