If you saw and handled one in person and liked it, and had a good vibe from your conversations with the reps, then there's no real reason not to get it. By single feeding it and doing your own stock work, you negate some of the downsides I mention. And a heavier bolt lift won't kill you in prone (F-class). The only real potential negative I can see (besides bolt lift) is the smaller ejection port for single feeding, but since you saw it in person you can determine if it's going to be an issue or not.
I'm personally not a fan of 3 lug actions, as their perceived advantages (quicker bolt throw) aren't as big of an advantage as some say (more often than not it's more of a detriment IMO) and come with their own issues. There's a plethora of great 2 lug actions out there. If it was me, I would probably be looking at the Defiance Deviant and spec it the way I wanted it and with a DLC or nitrided finish. Though I do understand that a lot of these actions are harder to come by in Canada and with a premium placed on them.
At the end of the day, the actions main job is to get rounds into the chamber, and extract upon firing. For your intended uses, the Deadline should be able to handle that fine. If you are happy with what you saw in the action, and liked the CS, then why not go for it.
