Your best position will change as your fitness and adaptation to the general tri position changes. You should wait for position refinement fitting until you're adapted to the position a little later in the year. At least I'm assuming you're looking for refinement, not gross fitting.

I think there is a specificity of training issue here. One thing that can mess up your ability to sit on the bike may be all the changing from bike to bike (fixed gear, spinner bike, etc.) Your Yaqui may fit you perfectly, but you may not be entirely adapted to fitting IT. I know that sounds like an oxymoron- as the bike should be optimized for the rider and not vice-versa, but switching from many types of positions that are widely different may be creating some of these issues. I would stick to riding your Yaqui and only your Yaqui if that is what you are going to race on.

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Tom Demerly
The Tri Shop.com

Tom, we shouldn't be training on a 73 road bike most of the time and on our 78 1-2 per week? What having fun on our mountain bikes? Or is it just a fine line?