♦ You can temporarily remove the curses of braccus rex set by using buffs. Cure Cripple by First Aid , Burning by Magic Armour , Slow by Haste,... these debuffs will be blocked by your armors later. They will stay like that as long as your armors are still up , curses reapply if armors are depleted.
( you may see the texts pop up times to times saying the effects are blocked tho )

Imo the curses arent the one that make them weak. Its thier stats , they are easily replaced or overpowered by higher level equipments or even ones at same lvl.

lvl5-Dallis's Hammer vs a lvl5 random 2-hand
http://i.imgur.com/NZHvgUK.jpg
Almost the same for other unique drops , except for some unique amulets added in this patch.

♦ As for source points , i believe they are reworking it ( not fully implemented in this patch yet ) , before you can easily cap all 3 source points on all four characters and still have alot points from other source pools/equipments which a little too overkill.

♦ You need to have Migo's ring into your character inventory to give it to Yarrow. Use that character to speak with her and you will get the option to give the ring.

♦ Some fight you were unable to beat need better positioning , break your character chains and position themself separate from each other or even take advantage of high ground if there are some around. Group up is usually bad because your party will be vulnerable to AOE.