OK...you have a bigger problem than I do.
The ZCO 5-27 is my favorite and sits on the AXMC. I only have one
. I love the "big screen TV" image of the 36mm tube. Great reticle (MPCT 3) and good turrets. Biggest plus is that It is an easy scope to sit behind for hours. It imparts no eye fatigue at all.
I also have a NF 7-35 ATACR on my AT. It is my second favorite. I know what some people say but I love my NF. I find that most don't understand that the setup of the diopter/focus/parallax is much more difficult to do. If not done properly, it can compromise the ability to be simultaneously focused on the target with zero parallax. Most people simply do not have the patience which leads to a lot of the criticism I read about here and elsewhere. Get it right and it is a great scope. Turrets, in terms of feel and legibility, are done right. It tracks like a champ. The MIL-C remains one of my favorite reticles. I can club you to death with it as well...LOL.
The whole high magnification benefit to me is maybe a bit different. At 25X, I truly believe that my 7-35 is clearer and more pleasing than the image from either my 5-25 ATACR or my S&B 5-25. Will the 8-40 be better at 27X than the 5-27?? If yes, that is an advantage. BUT.......Turret ergonomics and tracking accuracy are priority one for me. That is why I am leaning towards the TT. I would love to hear about how well it tracks provided you do a TT test on the TT...LOL
Lots to think about...