To the OP
A party without a leader will always be significanly weaker than a party with one. Period. No way around it.
In your particular case this is worse because you have three strikers and one defender. OF COURSE your strikers are going to go down alot. One defender can not lock down every enemy on the board, and you also have not controller support, who might otherwise be able to keep a few creatures out of melee for a while.
So far, you or your group members have vetoed all the possible responses. They don't want more healing items, they dont want anyone to change characters, you dont want to run an NPC. Basically, you want a solution but you are not willing to make a party change.
The only thing you can do is run less difficult encounters, run more of them per level, and hope player tactics picks up a bit(you said they have trouble focusing fire). Bad group design will be punished, and this is a suboptimal group. It may be sexy to dish out those big damage numbers, but this group would be vastly more effective with a real leader, and possibly a controler as well.
A party without a leader will always be significanly weaker than a party with one. Period. No way around it.
In your particular case this is worse because you have three strikers and one defender. OF COURSE your strikers are going to go down alot. One defender can not lock down every enemy on the board, and you also have not controller support, who might otherwise be able to keep a few creatures out of melee for a while.
So far, you or your group members have vetoed all the possible responses. They don't want more healing items, they dont want anyone to change characters, you dont want to run an NPC. Basically, you want a solution but you are not willing to make a party change.
The only thing you can do is run less difficult encounters, run more of them per level, and hope player tactics picks up a bit(you said they have trouble focusing fire). Bad group design will be punished, and this is a suboptimal group. It may be sexy to dish out those big damage numbers, but this group would be vastly more effective with a real leader, and possibly a controler as well.