Framerate issues on splitscreen

I’m playing mostly on splitscreen and I have problems with some maps. I understand that playing BTB on splitscreen might bring some hiccups when some massive fights are taking place, but there are maps that are just plain broken. There are issues with Complex, there are issues with Harvest, but what’s going on with Shatter is not even ridiculous - it’s disaster. I know that those maps where tested by same people who let the DMR and Boldshot with it’s current state passed as default weapons. Those people should be fired as -Yoink-.
I’ve paid for Halo 4. I’ve paid for Crimson Map Pack. If you cannot fix those maps, so they’re playable, then please give me others. I would be more than happy with Ghost Town, Turf or even good old Zanzibar instead of Complex. I would love to see Terminal, Longshore or any big map from Reach dlc’s instead of Shatter and Harvest, but because it won’t happen, please fix those maps, which sucks enough wihtout being broken.
Please.