Ulundill

So the problem I'm having is that my front line consists of Eder and my PC who is a Monk. Now as soon as any enemies see us they seem to charge for whoever the first person they see. So if they see Eder they all surround him and start wailing on him, but when this happens my Monk gets no wounds and is largely usless. Now if they charge my Monk first they all surround him and wail on him, giving him lots of wounds to use, but a) he dies since he's not as tanky as Eder and b) then it feels like Eder has no point as he just whacks at people's backs instead of soaking up damage like fighters are supposed to do. Does anyone have any tips, advice or any comments about this? Am I doing something wrong or is this just how it is? I wish Monks had a per encounter ability that could make one person focus on them or something. I really don't want to start over as a new class, but I'm finding my party isn't working well together.