I thought I should share a final post on this since I got so much great advice here…
A few weeks back, I nailed my season goal of a 40k TT < 1 hr using the redshift setup on my roadbike. To be precise, 58:56!
More surprisingly, I had a bit of an off day, and only averaged 248W to accomplish it! Mentally I knew after the first of three laps that I was going fast enough that I didn’t need to hit my planned target of 260W to get under 1 hr - so maybe that let me give in a little as well.
As for the final fit, I eventually flipped my newer 6 deg stem to -6 as @Power13 encouraged - but I still left one 5 mm spacer below it. I found I started to have problems on long rides without the aerobars when I got to this point - in fact, I even backed off this position for a few weeks before returning to it after some plank work - but the entire time I felt great riding on the aerobars. I made the video still below just to document the final position I used based on input from this thread.
For training - I probably did about half of the SSB2 HV plan in TT position outdoors in late spring as it was more comfortable than my road position. (those aero sessions led to piles of KOMs along the way ) Throughout the year, I probably did about a 50/50 mix of road and TT - but those weeks of SSB2 HV were huge and I am now closely following the SS progression thread on here as I want to take that to the next level now. I think it did far more for me than sustained power build did prior to that, and I had done SSB MV a couple times over last fall/winter with decent results, but still lacking long interval capacity. I can now routinely do 20-60 min efforts that used to be once a season kind of extraordinary output - yet also PR’ed my entire short/mid power curve this year as well. Overall, I’m becoming a convert to the Kolie Moore way of thinking about these issues - SS is great, but no more wasting time with 8-10 min SS intervals, and will also set my FTP more conservatively based on long tests so that it’s sustainable in volume.
My 1 hr attempt was an ideal course - three flat loops around a lake, around 80F, no significant wind, no traffic to deal with (no drafting either) and only one turn required using brakes. On my bike, I had a top tube soft bento box, XLAB torpedo BTA hydration, and no bottles/cages/pump on the frame. I did keep my likely very non-aero Varia though… can’t ride without it now. Also was the first run I ever did without gloves which I suspect helped. TT helmet, aero jersey/bibs.
After hitting some of my best power outputs ever at a series of 10 mile weekly out and back TTs, and knowing that I wanted to push my position further, I decided if I could hit my season goal, I’d get a TT bike - and I did! So - stay tuned to the bike fitting mega thread as I start trying to translate and further improve this fit over to a Cervelo P3! (I have a pro bike fit planned soon as well)
A big thanks to everyone who contributed on this thread and helped me earn my new bike
And hopefully some of this info is useful for anyone else considering the Redshift seat/bars in the future - it was a fantastic gateway for this year to learn if I wanted to stick with TTs and a great device for anyone not able to manage a second bike. I recommend it 110%.