I remember being given the advice that bike set-up for a runner is different to that of a cyclist - something to do with relative strength of different muscle groups and how the athlete is used to working.
My optimum position appears to be alongside the bike pushing. Worked a treat in the last duathlon. Might try and save some weight next time and remove the handle bars and saddle.
All the changes I'm making are to get into a more aggressive position, I've done enough cycling to have found a position that works on my good bike, and shouldn't have trusted a shop where the dude didn't even ride a road bike.
Making changes to get into a more aggressive position sounds like the way forward!
The easiest way to find out if you can trust someone is to trust them - Ernest Hemingway (he of several divorces & 1 suicide)
The more aggressive position is equal to what I have on my other bike that I've ridden for 10 years, tried an tested!!!