Either double the xp or have a multiplier for number of points captured.
They definitely need to to increase xp for objectives and decrease xp for kills. A multiplier is actually quite a good idea. You should also get bonus xp at the end of matches if you've captured the most flags/planted or defused bombs etc.
Give up playing anything other than TDM.
I only play Kill Confirmed or S&D in this game. I find other modes are ruined by the spawn system. Kill confirmed is excellent to get a load of points. Stick Specialist on and run around like a loony collecting every single dog tag you see and you'll get loads of xp.
			
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