Ever done corner jumps? That'll get both of you working on precision.
Also, set up a grid that's 3 jumps, 4 stride to 4 stride. Go through until you get the 4 strides on both perfectly. Then work on your adjustability of stride. So, do 5 strides, then 4 strides. 3 strides then 4 strides. Then do 4 strides, to 5 strides, 4 strides to 3 strides. Eventually you should be able to mix it up and get 2 +/- strides on both jumps. I always find it more of a challenge to shorten my stride between the first two then lengthen and take out a stride between the second two. So, like 5 strides, then 3 strides.
"Always be yourself. Unless you can be a unicorn. Then, always be a unicorn."