Ah! after all these years I finished IWD again, with all the recommended mods here and the HD patch, I was playing it for the last year from time to time.

I first finish the main story and changed to Heart of Winter before the first fight with Poquelin, beat first Tales of Luremasters and later Heart of Winter, coming back, and kill Poquelin.

Still a fantastic "Baldur´s Gate Tactics"

My team was like this, and it was pretty more effective than the first time I finished the game:

F/Human Paladin LV16 Lawful Good
M/Human Fighter LV 18 True Neutral
F/Elf Cleric LV 19 Neutral Good
M/Druid LV 18 True Neutral
M/Gnome Multiclass Illusionist LV 13 / Thief LV16 Lawful Evil
F/Half Elf Transmuter LV 17 Chaotic Good

It was a great team! worked fine in the most part of situations.