Hate to say it, but I'm at a plateau too.
Boredom is beginning to kick in big time. Its been 8 weeks.
So...I'm taking 2 weeks out from DC style and doing regular volume training.
Did a chest/ tris session yesterday and today I can barely type this post!
How weird!
And I was 12-18 reps on all exercises.
It was fun doing all those exercises not suited to DC such as kickbacks, tri-pushdowns, and the great LATERAL RAISES!! Can't wait for those tomorrow.
Do not fear though, I am not jumping ship. Just takin a break.
Recognise when you need to do this and you'll have more success.
EG