Yeah there is nothing wrong with running them towards the end of the cycle, most people use them to "kickstart" a cycle because they offer good strength and weight gains straight away.

Id definatly stick with the drol anyway, because you know it works, maybe try halo in the future sometime if you happen to come across it.

You could run hcg with your nolva and clomid.

Good luck with your competion, im interested to hear how you go.