Well you can farm Ur, even with the nerfs I think sorc can solo it easily. Grab Attunement, Acuity(the 2 magic augments, from mage and sorc), Bloodlust, Autonomy(2more magic buff, from assassin) then Lethality(15%more dmg on core skills, from warrior) and then whatever you like don't really matter, maybe longer enchantments from mage. After that go sorc, make sure you have trained the charged bolt, make sure to have the holy weapon buff equipped and you're good to go. When Ur arrives, cast the holy buff on your weap(make sure to cast a lvl 2 one, after the first bar is full it charges a 2nd bar faster, makes the buff lasts a lot longer if you wait a bit more), then simply spam charged bolts, which is light attack charge until there's the little noise, and release in the direction of the dragon, it'll auto target. The thing is it goes through the dragon, so for example if you hit a leg, it'll generally hit the leg(maybe 2 hearts on it), then the thorax, then the other leg on the other side. Can kill it super fast that way, also once you have money you can buy a bunch of talisman from fournier to increase your magick to kill it faster, which might be necessary since bloodlust and autonomy were nerfed a lot. Use them 4 by 4, they stack up to 4.
anyway that's what I did on my char to increase magic, I could kill Ur in about 1min and a half or so with the sorc. Since you can charge while moving too, it's really super easy to avoid stuff or position correctly. Only when you're near the end you want to spam light attacks to have more accurate shots to finish the hearts that are left.
Problem will be if you haven't maxed your vocations before you finished the game, as it's annoying to farm them before post game. If you didn't I recommend checking youtube for a speedrun video, then just rushing through the game to get to post game again. It's really fast tbh as I said.
For BBI otherwise, I would recommend you don't decurse every item you find originally, and try to keep only decursing lvl 2 and 3 items. You get quite a lot of RC from the mobs in there and especially certain chests or corpses. Also if you're a MA, get Ricochet, there's a lot of mobs that are weak to lightning and a lot of places ricochet can do massive dmg. For example the wolf, if you bring it into the stairs leading to the large room and shoot ricochet, he'll die in like 20seconds and get perma stunned from all the rebounding shots. I would definitely consider dropping the light arrow, BBI isn't that dark most of the time.