Ladies and Gentlemen, some of my ideas to improve Control. Take these with a grain of salt as I am not an expert
-Big Brother
I don't know why this keeps happening but for most matches in control, I often found that a third of the team or even just a couple of players were doing extraordinarily well while the others did notably less well. This needs to be fixed because not only does it not improve players, it also can cause team wipes depending on the skill of the big brother in question.
-Care packages and armor reduction
This one sounds balanced because an equal amount of them land on each side. However if one team is destroying the other then the CP weapons and gold armor land in the hands of the enemy which makes the chance of recovery even worse. This can be fixed by providing gold weapons instead of CP weapons and removing gold (and purple) armor from the care package and limiting purple to lifeline packages.
-Mobile Respawn Beacons
I think this is pretty straightforward, these either do nothing or act as a major nuisance as the enemy team floods the point, making defense even more difficult. My suggestion as replacement is a temporary fourth point to not only take flak off B but also to act as kind of a mobile respawn beacon while ensuring a much greater impact on the battle and temporary so that teams aren't spread too far apart.
-People joining an existing match
They should not be getting purple gear. I think instead they could start with purple weapons, I think these don't have as much impact as armor and since these people join usually quickly after a match starts it sill has some good effect.
There are probably more but these are the ones at the top of my head.