Any suggestions about adjusting hyper-parameters?

[Jessespace]

Can you provide some advice about how to adjusting hyper-parameters in object detection?

1. I have tried the ssd algorithm ,and got 90% mAP,but it's difficult to further improve.
2. I also tried the faster R-CNN,I just got 30% mAP,how to adjusting the params,like anchor size,iou...
   Thanks!!!