My suggestion to play without Twallans' mods is just to determine if one of his mods could be the cause of your freezing. I know what you mean about not wanting to play without them. I'm currently having the same problem and when I remove his, the game runs perfectly. His mods are great, it's just that they seem to be quite fragile and anytime you add content to your game or make any changes at all even if the change has nothing to do with his mods, they start acting up. I've found that you have to remove his mods, make your changes and add them back in. It's a pain, but for me, that's the only way around the freezing issue. I hope you get your freeze resolved, it can be extremely frustrating.