I've been thinking about the too weak Lannister in a 5 players game and I realized that the problem wasn't that he couldn't defend himself against an agressive Greyjoy (because with some tricks he can easily push him out of his way) but this defense prevented him from expanding his territory in the first 2 turns.
I thought about another variant for the 5 player game :
-Lannister has one more footman on the top of the neutral force of king's landing wich is played as a garrison.
-The neutral force represents the golden cloaks serving the lannister at the beginning of the game.
-He can't put a power token on it.
-If he leaves, he has to conquer it back as if it was a normal power token.
-If he has success in cp*mustering and reaches a force of 5, the power token is removed.
The goal of all that is first, to make difficult for the baratheon to take king's landing.
-To put him in an emmergency to prevent lannister to muster.
-To allow the Lannisters to finally be the real power they represent in the books
It doesn't make Lannister too powerfull because :
-He's still lower than baratheon on the fiefdom
-If he wants to put a defense order, he can't muster and he allows baratheon to move all of his ships in order the take KL in turn 2
-If he wants to muster, he can be raided by the footman in king's wood.
-(maybe we could say that the Stannis card special effect works in this case ?)
-(We could also reduce the garrison/neutral force to 4 meanwhile it's occupied by the Lannisters)
I've never tried it yet, I can't say if it's not too powerfull or too heavy against the Baratheon (for a 4-5 players only) but I think that with real established houserules, it could work.
What do you think about it ?
PS : I'm not a native English-speaking, sorry for the orthography.