Yes, I understood you the first time, I think. What you say is, given a Fortress, you would call normal capture the time an appropriate army would take to capture it, and fast capture the time a huge army would take to capture it... that is, after a certain army size (or quality of troops, or Fortress HP, whatever), you want to cap capture time. That's why in your example you trigger exponential decay after some point because the decay rate is too large. It would work, it’s somewhat equivalent to a capture slots cap, but I think it'd be confusing and frustrating for players to be confronted with a capture slowdown midway the process. That’s why I said, instead of doing that, just cap the rate, and enjoy a linear behavior all along. In your example, “if you are capturing a CC with a total of 500 pts per sec”, just cap that to, say, 300 pts per sec, or whatever that results in a capture time similar to the linear+exponential decay case. Setting a maximum capture rate is a less complicated technicality than combining linear and exponential decay, and it’s a nice and simple way of fixing a minimum capture time. That’s what I meant with a slower linear decay being able to do what you want: nerf fast capturing, leaving alone normal capturing.   Good to know!  

In any case, I would PR for what this poll gets us. There haven't been any reason given for the poll proposals to be rendered invalid. The result of 1. would make capturing more difficult then my own taste but whatever...

As a starting point, it seems fine to me. Still, I think that in some normal circumstances, capturing is still a bit too quick/easy. Maybe 1000 points are enough. We’d need to test it.

Every turn, a structure losing over 200 pts would resist better to the remaining capture pts it is meant to lose. This would be clearly aiming at making capturing faster less then a certain amount of time, much harder, without making any changes to normal capture difficulty. In other words, nerf fast capturing, without impacting at all normal capturing. And without introducing a complicated technicality players would need to be aware of.   Already indirectly the case, since capture speed is increased by how much a structure has lowered hp.

But what would be the effect of this? What's the difference of having a linear decay followed by an exponential decay, with a slower linear decay that results in the same capture time? There would be a difference only if actual (not total) capture points have an effect on some other stat. If the idea is that it would be noticeable on structures with a lot of capture points, then just give them more capture points (for the linear decay to catch up with the linear+exponential decay), unless I'm missing something. Something else I don’t know how it works is the effect of siege engines on capture points, which they should have to make their use make some sense besides destroying things. Since an army made only of soldiers or only or engines should have a very difficult time taking on a Fortress, I’d say that engines should increase the soldiers’ effect on capture points (not by proximity, but when actually taking part of capture), that way a mixed army would be more efficient.