Reply to Transitioning between genres??

I have been practicing my mixing skills, mainly between genres, for example, DnB to Dubstep, or electro to house, or dubstep to electro house.

My problem lies in, the only good transition point I can find between two different genres, is the break/build up halfway through a song? Am I not focussing hard enough to find exceptional spots to transition.

I know they all go 4x4 as far as beats/bars. And I know the tempos vary very much, any help is appreciated.