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If it's the front end position then I'd consider:
- Stack: go up and down 20mm increments if you can make the change quickly
- Angle: assume non-UCI so start say 15deg and angle up from there (but be aware you need to be able to see forwards
- Elbow position: narrow vs wide, pad reach potentially
I have some of the newer Tririg bars that are about to be sold but if you want to borrow for the tunnel you are welcome to as you can do the above super quickly, otherwise I'd bring a mate with good mechanical skills that's practiced with you doing the changes. I had the Shiv Disc extensions so I spent a good amount of prep time just practicing swapping out spacers so on the day it was as quick as it could be (we had 3 of us as a well drilled machine in the end doing it).
- Stack: go up and down 20mm increments if you can make the change quickly
onyerbike-
When I went to the tunnel I had @scherrit along and when I was with Xav it was a paired session so you have time to do stuff while another rider tests and it was mostly little bits and pieces.
My TT bike is in storage at the moment because I've not yet committed to racing it again this year but if I do it will be later in the year and I wouldn't have a lot of time for testing even if I could get a session. I'll probably end up bolting on a "visibly faster" front end and hoping that it is actually faster then worrying about testing later.
hippy
I always have things I want to test though which helps. When I've done testing before it's a bit of a combo of things I want to do and maybe some stuff the testers suggest. In the tunnel I basically said "don't touch the back-end, I can ride 24hr in this position, just do arm stuff" and so they came up with a bunch of stuff to do to the front-end. It was obvious stuff though - go wider, go narrower, go lower, go higher. No big positions changes. The more optimised you are the trickier the changes. When I rode the track with Xav it was a bunch of stuff I had to test and it was kind of annoying because it validated all my choices anyway and we didn't find any free speed! #icanseeairflow
Regarding test time, you have to be slick - so remove Di2 cables and shit to be able to quickly swap positions. Maybe borrow bars or something. Normally for me it has been easier stuff - testing bento boxes, helmets, calf guards etc and not big bar/position changes.