- As you are able to do the frogkick, are you capable of hanging steady on a certain position and swimming the backkick?
If you are, try to stop swimming (way more!) frequently, and when you stop, look backwards or around/front of you to gain an even better overview where your students (or the ones you're guiding) are.
It'll not only break down the amount of swimming you do (it'll slow you down), but you will also gain overview, which makes you a better guide/assistant, since you can anticipate better on potential problems.
If you aren't capable of swimming the backkick and staying on an exact position yet, go and train this! Find an instructor or other diver who is known with these skills, and train, train, train...
It will do you good, even if you can't get the mindset of stopping frequently :blush:.
- Take a look at your fins. Which ones do you use?
If you don't yet use them; try Jetfins/Turtles. These fins take a little more effort in swimming since they are less flexible than regular fins. Moreover, in combination with your wing you'll be able to gain more precision in your position in the water (and why an exact position in the water -> see above).
Good luck!