So I just started chapter 6 with my party and im getting close to the end of the game and I was thinking about possibly going through HOF mode with my party. I read some guides on gamefaqs about HOF mode and they all seemed to revolve around breaking the game using really exotic builds and level squating neither of which seem like fun to play.

So far my party is at the beginning of six and steam rolls everything that comes near it. I almost never have to reload and I think I've had some one actually die like 3 or four times so far. Does anyone who beat HOF mode think this party would be fine for the next game mode.

I have four tanks. A paladin of helm, a cleric of iltmatar, a barbarian and a druid. The paladin and the barbarian can pretty much wade into combat and wreak everything. The cleric and the druid can buff themselves and keep up just fine with the other two.

I have two back line archers a bard and a specialist wizard conjurer. They both buff the party and debuff the enemies and fling arrows and bolts every where.

At level 20 I was thinking about taking 10 levels of fighter with the paladin, barbarian, cleric, druid and wizard for extra feats and good BAB and hit point progression since they pretty much got everything they're going to get in their classes. The bard i was going to take to lvl 30 since the bard still keeps getting new spell levels all game.

Anyone think I will be ok with the fighter levels or do you have other suggestions for multi-classes. Everyone is level 15 right now.

Your party will do fine in HoF mode.

I'd keep the classes pure or take only 4 fighter levels. Extra feats are quite useless, there are only a few which make a difference.
Extra paladin levels will yield better smite evil and more spells.
For the barbarian extra damage reduction can be very useful.
Cleric, druid and conjurer get longer lasting spells, spells like shades also improve with caster levels.