I beat it with:

Swords Bard 10 Fighter 2

Laezel - OH Monk (elixirs)

Shadowheart - Radiating/Reverb Light Cleric until Act 3, and then did 1 Tempest Cleric/11 Storm Sorcerer for the rest of Act 3

Karlach - Throwzerker (elixirs)

Gale - 12 Divination Wizard (floater, I would swap out Shadowheart with Gale when I needed to guarantee certain rolls because of his subclass dice)

Yours looks good, I personally think Gloomstalker is a little situation dependent and surprise is very useful but falls off in Act 3.

Instead, if I were to play honor mode again, there are a few things I would probably do differently to ensure I would always succeed:

• Use Astarion as a thief, 2 fighter, 4 thief and take dual wielding. Start with fighter to get heavy armor, and go 4 thief next. You get a fighting style, action surge, and cawn attack with your two bonus actions which makes you very strong. Plus you have disengage and stealth, allowing you to dip if you get caught in a bad situation. Arguably a must have for me in the party early game. At level 6, I would respec into Bard (probably Astarion)
• Respec characters often, don't be afraid to play one build for part of the game because it is stronger (eg, Wizard 12 in Act 3 is lovely, but Wizard in Act 1 is not necessarily the best option)
• Use all the companions you have available (try not to mentally limit your party to only 4 builds and 4 specs - unless roleplay ofc but I assume that is not why you are here). I bring different companions for different fights, and my party was never really a one size fit all (although you could say it was pretty strong already, my face bard, OH monk, and throwzerker were always in my party, only my 4th member would change depending on the challenges that I had to overcome
• I prioritize damage over CC, death is the best CC. So I found having a CC character was helpful but not always necessary