I'm not sure on the errors, but to reduce the amount of objectives, you can do it a few ways.

1. You can make the AO smaller (put a marker down in the editor. Name it. Put that in the whitelist field in the military objectives civilian and military modules to have the units primarily spawn there. You can also add another one where you don't want units to spawn and put it in the module blacklist field).

2. Or you can increase the filter size for size and priority in the same modules (change "do not filter" to "very tiny" or to" small," or higher, for example).

You can safely use more than 80 objectives depending on what you want to do and the kind of performance you want but I try not to go above 100 or so. You can probably go higher than that but definitely play around and see.

For more read this: http://alivemod.com/wiki/index.php/Military_Placement_(Military_Objectives )

Attempt to override final function isn't an error, you can safely ignore it. It's just default Arma 3 rpt spam.

FYI, I go as high as 120 objectives and have no issues. I'd say keep it between 80-120 max and you should be good to go.

One rule of thumb I typically have for insurgencies that can help reduce your objectives is to only give the Assymetric AI commander civilian objectives and not military objectives. My rationale for this is that rarely would you see a group of insurgents attack a well equipped military installation or FOB. So I typically will make my occupying force have A Military OBJ module and a CIV obj module that is set to only medium or high objectives. The Assymetric will have a CIV obj module with no filtering and not synced to the Occupying enemy force. That way...objectives stay low, and the insurgents stay in towns to gain recruits and cause mayhem. Also..I don't have my occupying force squashing them quickly because the smaller towns stay unguarded, allowing the insurgents to build up their network there.

Just my .02.