Crashes in Origins- any way to find a solution?

Hey folks, not sure where to put this so here I go.

I've decided to replay Origins modded after years of not touching the game, and to my dismay it is crashing constantly. I was fine at the start, but from Redcliffe Castle onwards I've had semi-regular crashes in combat (and only ever in combat). Sometimes it seems changing area (especially reloading to a save in an area earlier than where the crashes happen) suspended the problem for a time, but it never went away since then.

Problem is I have quite a few mods that are a pain to install/uninstall, primarily Improved Atmosphere and Dragon Age Redesigned, along with a few others such as Grey Wardens of Ferelden and a camp storage mod. I had them all installed when I began my game so I have no idea which one could be causing these issues. I have a suspicion however; I used a mod that allowed me to change my character's face while in an active game, but I used it first a lot earlier than Redcliffe so I'm also unsure if that's the problem (hopefully not because then that save is screwed). And I'm not redoing fresh starts with X or Y mod installed/uninstalled until I find the combination that doesn't crash.

So my more general question is, is there any way to find out? I've tried finding a log file but it doesn't seem to even mention the game crashing. Does anybody know of a possible solution or troubleshooting at least?