Hi!
The first thing, as far as I know leveling tool cause problems in 1.0, specially because it is for A21 and it does not work in 1.0. That would be the first thing I would do, remove any mod that do not have an updated version for 1.0. Even if "in theory" some mods for A21 can work in 1.0 it is still more likely to cause errors. The other 2 OCB mods I do not know, but I know for sure that leveling tool DOES NOT WORK 100% fine in 1.0. Anyway, none of the has any sort of interaction with my mod or what my mod adds to the game.
The mod "inventory mouse wheel" starts spamming errors right from game load, without even trying to load a save. It does that without any other mod installed, other than the 3 mods from OCB, and the error generated are not related to the xml as far as I can understand. That means that there is some problem with one or more of those 3 mods, and you should ask the creator if they can update to work in 1.0, because right now they are not functional.
When I add a bunch of xml mods, including mine, the xml mods load fine without errors and again, errors spam as soon as the game tries to load Inventory mouse wheel". That would be the first mod I would remove before trying again but like I said, you should ask the creator or the mod or simply wait until they add support for 1.0.
But it has nothing to do with my mod, so I cannot help you much with this, sorry.
Crashes are quite rare with xml mods, and are almost always related with dll (when it is because mods, crashes can also be because of corrupted game files and other things).