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@gbj_tester
No you don't
Tri bar positioning is a dark art. You need to have good control, comfort, power generation and aerodynamics. Unfortunately, that's 4 parameters which need 4 different positions. Typically, you have 5 degrees of freedom to play with at both the elbow cups and the hand grips (x,y,z,yaw and pitch - roll is irrelevant) Taking just the xyz positioning, you have a range of about 100mm which needs refining in maximum steps of 5mm, giving approximately 64,000,000 possible combinations before you start worrying about wrist angle. One of these will be right for the speed you're doing now, but it will be wrong for the speed you end up doing after you've optimised your tri bars, and whatever you end up with this year will be wrong again next year if you develop at all, because you'll a: be going faster, making it worth sacrificing more W for every CdA gain, and b: adapt to the position which will allow you to move to a more radical one while achieving at least as much comfort and control as you had when you first started. Welcome to our world.