hi freakturd,
perhaps there is not enough isolation between your huawei node B and the area you want to cover, whereas there is enough isolation with other node B’s (ericsson, nokia) ?
I’m not a 3G expert, so excuse me if i’m wrong, but an Ec/Io = 3 sounds really bad.
Well, i can’t help much, but i hope someone else can. Otherwise, you could just ask for huawei support about this.