i think nerfing the witches has put them out of use and may be with reduced troop housing space, they may be useful again,
Also the long time it takes to research a troop , i think atleast 2 troops should be able to research at a given point,
Also walls take a long time to be upgraded mainly because of the high cost. that should be reduced too.

So my suggestions:

1) Reduce housing space of witches to 8
2) Lab to research atleast 2 troops at a given time. May be boost can be added to Labs too.
3) Reduce Wall upgrade costs.


I also suggest boosting builders.
Reduced Hero Upgrade time or adding boost to that.