If lines looked jagged, your best bet is always upping the game resolution. Go as high as possible while still retaining 45fps. If the game has a decent antialising mode that doesn’t blur the image too much, that also makes sense. Dial details down and up the resolution instead, in most games that’s the better choice.
The game will be looked into shortly in regard to an official profile. I can’t promise yet whether that will be any better than what you got now, but maybe you want to wait for that.