City - a lot of "not enough flat"

[Gofrit]

Hi @Prometheus, and hi at the dev.
We have a big problem of terrain not buildable with "not enough flat" in La Ruche (the one in north under Northguard, could you wipe the 0 hamlet town by the way ? why the cities not disapear ?).

Here you have the map of city in 1x1 square. NF is the "Not enough flat" zone that I have detected. We have a big space lost in the upper right quarter and we have some problem in the middle left part. We could accommodate with the down left corner.

Could you do something about it ? actually we try to find some space to project the siege workshop and the prison and the housing and it's a headache with this situation.

Thanks a lot