If you have a target, use it. Training for 2k has to be progressive: first develop the necessary stroke via technique and strength, then use it at increasing rates and shortening distances.Anyway, colour me confused and any advice would be much appreciated!
This is seen in the 200-odd Interactive tables which are still around on the net somewhere.
The math is simple if you use Watts. For example: a 7' 2k is 300W. So if done at rate 30, the stroke has to be worth 10W' (= W/rate).
7:20 is 110s or 1:50 pace and 260W and quite a bit easier. If you can pull a 10W stroke without dying half way, rate 26 would be enough.