I agree with that. The issue of too many units capturing one building in the first place.

This was already the case, adding regen rate just shifts the curve rightward. Also, I don't get how adding 1000 points would help that much in the cases you bring up. 5 seconds to maybe 5.5 or 6 seconds?

That’s a nice move. 35 and 50 with an upgrade sounds good.    I’m not exactly sure which issue you’re referring to, but in any case, 20 is a low number. Increasing it would make sense.    Let’s say it’s better not to stack all your hopes behind one fortress. 

That would be one of the easier balance corrections, but it wouldn't fix the issue.  What if a player attacks you with 200 Marian Roman Legionaries? That are magically stacked in a corner of your Fortress. The end result would be the same. No, the enemy needs to surround the Fortress, and you can't surround it with 200 units.

Remove disbanding formations… thereby turning formations into battalions. Bad idea. I personally have never encountered this exploit everyone is mentioning, and it doesn’t seem like it would be much of a problem if we just fixed collision.