I've put plenty of CF seatposts into C&V steel frames, mostly Ironman models, and I've used the exact Ascent seatpost to which you refer.

Not knowing anything about torque or tolerances, I simply tightened up the binder bolt to what I thought was right, and rode the bike.

No problems whatsoever. They actually look pretty good in some frames. I remove the lettering, however, can't abide that, given a choice.

I've also used CF Satori and CF Bontrager posts in steel frames, no problems whatsoever.